A notable operation during the 2012 Olympics in London was, from what I recall reading at the time, the live transmission of the various outside broadcast TV cameras, which had always given problems linking ground-based relay units. The transmissions were aimed upwards to a King Air which was in a hold for hours at a time at about 20,000 ft over Lambourne VOR, which then transmitted onwards down to a single ground receiving station. Apparently it worked fine, but a bit of a tedious one for the crew.