In answer to the original post, I was the Sound Engineer responsible for the sound transmitted for the Bupa Great Edinburgh 10k on Sunday shown live on Channel 5 and 'farmpilot' is spot on.......the first helicopter was beaming live pictures of the race down to our scanner, the other two helicopters each had their dedicated motorbike cameras for which they are used to down link the relevant pictures to us in the TV Compound. None of the helicopters were Police Helicopters but no doubt the Police Helicopter was in the vacinity to keep an eye on the crowds attending the many events taking place in Edinburgh this weekend.
Hope this answers the question.