There has been no formal assessment of this overlap. However, research to estimate digital satellite coverage was carried out by Ofcom’s predecessor, the Independent Television Commission, in 1999.
This research arrived at the 98 per cent. coverage figure which found that the main contributory factor which resulted in 2 per cent. of households being unable to receive any satellite signals was man-made obstructions in built-up areas. For terrestrial transmission, the opposite situation to satellite applies, with transmitters located so as to serve population centres. The locations not covered by these transmitters are largely in remote, sparsely populated areas. This means that the overlap between the 2 per cent. for satellite and 1.5 per cent. for terrestrial digital TV should be very small.