Main transmitters are in red
R1 = Radio 1; R2 = Radio 2; R3 = Radio 3; R4 = Radio 4
Opt-out service: f = Radio Foyle
Pol = polarisation: H=horizontal, V=vertical, M=mixed (both horizontal and vertical)
All frequencies in MHz (megaHertz)
Max ERP = maximum equivalent radiated power
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