UK TV aerial groups explained: A, B, C/D, E, K, T, W and wideband

UK TV aerial groups (A, B, C/D, E, K, T, W and wideband) describe the UHF frequency range an aerial is optimised for. The right group depends on which UK transmitter serves your postcode — Crystal Palace uses Group T, Sutton Coldfield uses Group B, Winter Hill uses Group A wideband. The wrong group means lower signal-to-noise and more dropout in marginal conditions.

The UHF spectrum, in one paragraph

UK Freeview lives in the UHF band between 470 MHz and 694 MHz. That slice is divided into 28 numbered channels — channel 21 through channel 48 — each 8 MHz wide. A “transmitter” doesn’t broadcast on one channel; it broadcasts a handful of multiplexes (BBC A, D3&4, BBC B HD, SDN, ARQ A, ARQ B) spread across that range. Different main transmitters were assigned different slices of the band so they wouldn’t interfere with each other. An aerial group is just the name for an aerial whose elements (the horizontal rods on the boom) are cut to lengths optimised for a particular slice. Match the aerial group to the transmitter slice and you get the most gain for your size of aerial. Mismatch them and you’re still receiving — just with less headroom against noise, rain fade and ducting.

The groups in detail

The seven groups below are the ones you’ll actually find labelled on UK-market aerials. Channel ranges given are the current post-700 MHz-clearance definitions; older aerials may show wider ranges because they were made when channels 49–68 were still in use for TV.

Group	UHF channels	Frequency (MHz)	Cap colour	Typical transmitters
A	21–37	470–606	Red	Winter Hill, Caradon Hill, Pontop Pike, Belmont, Rowridge, Stockland Hill, Waltham, Ridge Hill, Caldbeck-shadow relays, most Scottish mains (Durris, Angus, Selkirk, Darvel, Rosemarkie), Welsh mains (Preseli, Blaenplwyf, Llanddona, Carmel)
B	35–53	582–734	Yellow	Sutton Coldfield, Tacolneston, Heathfield
C/D	48–68	686–854	Green	Dover, Beacon Hill, Huntshaw Cross, Guildford, Reigate (legacy — most C/D transmitters have been re-planned, but the aerials persist on roofs)
E	35–68	582–854	Brown	Hannington (Berkshire / north Hampshire)
K	21–48	470–694	Grey	Emley Moor, Mendip, Wenvoe, Black Hill, Sandy Heath, Bilsdale, Oxford, Divis, Caldbeck, Sudbury, Moel y Parc, The Wrekin, plus most local relays
T	21–48 (post-2020)	470–694	Blue	Crystal Palace, Sandy Heath (transitional)
W / wideband	21–48 (current)	470–694	Black	Sold as a single aerial that works anywhere

A few notes on that table that matter:

Group A is the most common. Most UK main transmitters were originally planned as Group A because the lower part of the UHF band propagates marginally better and is quieter.
Group B corresponds to the upper-middle slice. Sutton Coldfield is the big one. A Group B aerial pointed at a Group A transmitter will work in a strong-signal area but will lose 3–6 dB of gain compared with the right group.
Group C/D is the historical “upper band” group. Most C/D transmitters were re-planned during digital switchover and the 700 MHz clearance, so a brand-new C/D aerial is rarely the right buy. The colour is still useful for identifying what’s already on a roof.
Group E was a “covers most of the upper band” compromise group for transmitters like Hannington that sat across the B/C boundary.
Group K is the modern grouping introduced specifically for the post-clearance UK plan: it covers exactly the channels Freeview now uses (21–48). A new Group K aerial is, in practice, indistinguishable in coverage from a modern wideband.
Group T is the other modern grouping, originally specified to cover channels 21–60 during the clearance transition. Crystal Palace is the headline T-band transmitter. After clearance completed in August 2020, the meaningful range of a T aerial is also 21–48.
Wideband (W) historically meant channels 21–68 (the entire pre-clearance UHF TV band, 470–854 MHz). Modern widebands sold today cover 21–48. Both still work — see the next section.

What “wideband” actually means

A wideband aerial is one whose director elements are sized to give roughly even gain across the whole of the UK UHF TV band, rather than peaking in one part of it. The trade-off is on the label: a 48-element wideband typically delivers 1–3 dB less peak gain than a same-size grouped aerial when both are pointed at a transmitter that suits the grouped aerial. In return the wideband works for every UK main transmitter and every channel allocation, current or future.

In strong-signal areas — most of urban Britain — that 1–3 dB doesn’t matter. The signal at the wall plate is well above the threshold the tuner needs. In weak-signal areas, fringe areas, or anywhere with co-channel interference from a distant transmitter on the same channels, a properly chosen grouped aerial is the right answer.

The 2017–2020 channel reshuffle and 700 MHz clearance

Before 2017, UK Freeview used UHF channels 21 to 60, occupying 470 to 790 MHz. Ofcom’s 700 MHz Clearance Programme reallocated channels 49–60 (the 694–790 MHz band) to mobile operators for 4G and 5G use. Region by region, transmitters retuned their multiplexes down into the surviving 21–48 range. The programme finished in Kendal and the Isle of Man on 19 August 2020.

Practical consequence for aerials:

Any “wideband” aerial sold before about 2017 is rated 21–68 or 21–69. It still receives Freeview correctly. It just receives nothing above channel 48 because nothing’s broadcast there any more. Don’t let an installer replace one purely on grouping grounds — it’s only worth replacing if it’s corroded, the balun is failing, or the alignment is off.
A modern wideband or Group K aerial is rated 21–48, which exactly matches what Freeview uses today.
Group C/D and Group E aerials face the most awkward retirement. Their gain peak is now mostly above the channels you actually need to receive. In marginal areas, replacement is usually warranted.

How to identify your existing aerial’s group

Two methods.

The easy one — the plug cap colour on the end of the boom (the horizontal aluminium pole that holds the director elements). The cap is a coloured plastic stopper that seals the boom end. Red = A, yellow = B, green = C/D, brown = E, grey = K, blue = T, black = wideband. Some manufacturers also colour the balun housing or apply a coloured sticker near the dipole.

The technical one — count the director elements and measure the longest one. Group A aerials have longer directors (because the wavelengths at 470–606 MHz are longer). Group B directors are noticeably shorter. Widebands typically use a mix of element lengths along the boom — sometimes called a “log periodic” element pattern when the spacing also tapers. This is harder than just looking at the cap and isn’t worth doing from the ground.

If your aerial is unbranded, has been on the roof for fifteen years, and has no cap at all, treat it as wideband for planning purposes — that’s the safest default assumption for an aerial of unknown vintage in the UK.

Finding out which group your area needs

Three sources, in order of usefulness:

Our transmitter directory lists every UK main transmitter with its channelGroup value pulled from the same dataset our installers work from. If you know which transmitter serves you (the direction your neighbours’ aerials point is the cheapest postcode-to-transmitter lookup ever invented), look it up there.
Freeview’s official channel checker takes a postcode and rooftop height and returns the transmitter, its bearing, and the channels its multiplexes are on. Cross-reference the channel numbers to the table above.
A signal-strength meter on the roof is what an installer uses. If you’re commissioning a fresh install, ask which transmitter and channel group they’re aiming at — a competent installer will tell you both before they quote.

Or use our postcode → transmitter tool which short-circuits all three steps — enter your postcode, get the transmitter, bearing, group and aerial type recommendation in one go.

When the right group really matters

Fringe areas where the strongest available transmitter is 40+ miles away and the signal at the rooftop is within 6 dB of the tuner threshold.
Co-channel interference zones where a second, more distant transmitter uses overlapping channels — narrower group means better rejection of the unwanted one.
Atmospheric ducting conditions (high pressure, calm air) when distant Continental signals can intrude on UK channels. Group selectivity helps.
Masthead amplifier compatibility — many masthead amps are themselves grouped, and pairing a wideband aerial with a Group A amp (or vice versa) gives you the worst of both. Match aerial, amp, and transmitter.

When wideband is fine

Strong-signal urban locations within 15 miles line-of-sight of a main transmitter.
Locations where you may want the flexibility to switch between two transmitters (e.g. some Hertfordshire postcodes can pick either Crystal Palace or Sandy Heath).
Communal aerial systems serving flats where one feed must work for every tenant regardless of what’s broadcast.

In all three cases the small gain penalty of a wideband is offset by simplicity and future-proofing.

FAQ

What aerial group do I need in Manchester? Most of Greater Manchester is served by Winter Hill, which broadcasts as Group A wideband. A Group A grouped aerial or any wideband will work. Specific postcodes in east Manchester sit in the Winter Hill shadow and are served by the Saddleworth relay (Group K, vertical polarisation).

Will a wideband aerial work for Freeview? Yes. Every UK Freeview multiplex is now within channels 21–48, which falls inside every wideband aerial sold in the last 20 years. The only meaningful question is whether wideband gives you enough gain in your particular location — see “When the right group really matters” above.

What’s the difference between a Group A and a wideband aerial? A Group A aerial has its elements cut for 470–606 MHz and gives roughly 1–3 dB more gain in that range than a same-size wideband. Outside 470–606 MHz it falls off sharply. A wideband gives slightly less peak gain but covers the full 470–694 MHz Freeview band evenly. If you’re pointed at a Group A transmitter (Winter Hill, Belmont, Caradon Hill, most Scottish and Welsh mains) and you’re in a marginal area, Group A is the better choice.

Why are aerial groups colour-coded? Because UK installers historically worked off ladders with no labels visible from the ground. The coloured plug cap on the boom end is visible at a glance — red, yellow, green, brown, grey, blue, black — and lets an installer or surveyor identify the existing aerial without taking it down. The colour code is an industry convention rather than a regulated standard, but every major UK manufacturer (Antiference, Blake, Televes, Triax, Wolsey) follows it.

Is a Group K aerial the same as wideband? Functionally, for current UK Freeview, yes. Group K is defined as channels 21–48, which is exactly the surviving Freeview range after 700 MHz clearance. A modern wideband sold today usually covers the same range. The label difference matters more for older stock and for installers ordering matching masthead amplifiers.

My aerial is from the 1990s — do I need to replace it because of the channel reshuffle? Not for that reason alone. Old wideband aerials (rated 21–68) still receive everything Freeview broadcasts. Old Group A aerials still cover most non-London main transmitters. The aerials worth replacing are corroded ones, ones with a failed balun (look for water ingress at the dipole), and grouped aerials that no longer match the channels their transmitter now uses — Group C/D in particular.