Pen y Banc
Wales · TV
Position 53.036584, -3.377956 Grid reference SJ07704970 Nation Wales Ground height 226 m Antenna height 21 m Aerial group Group A — C21–37, the low end of the band Polarisation Vertical BBC region Wales ITV region Wales ITV news region Wales Parent transmitter Moel y Parc Ofcom site number 14524 The position is our conversion of Ofcom's grid reference SJ07704970 from OSGB36 to WGS84 [V] . Ofcom publish no latitude and longitude for television sites. The transform is verified rather than assumed: on the 3,403 radio records that carry both, it reproduces Ofcom's own coordinates to within 0.1 m.
On the map
Pen y Banc is not the strongest signal anywhere the model predicts — it is shown here in place. That is normal for a relay, which fills in inside a main station's area.
Television This site carries the three public-service multiplexes and none of the three commercial ones, which is the normal arrangement at a relay — 1,059 of 1,169 sites are like this. Channels on SDN, ARQ A and ARQ B are simply not transmitted here, and no aerial will recover them; they need a main station. PSB3 (BBC B) is the UK's only DVB-T2 multiplex and carries every HD channel. Losing the HD channels while keeping the rest is therefore a single-multiplex fault rather than an aerial problem.
Transmitter data is Ofcom's; every dataset and the terms it is used under are listed under sources . Coverage figures are modelled, not measured, and are systematically optimistic .