I was at Byron when they took the Type 99 off in Jul 98. ISTR the transmitter cabin was about 11 tonnes which was right on the limits for the Chinook and conditions. There were several attempts due to the fact that the thing had to break some suction from having been there so long.
Eventually, the thing lifted and the Chinook disappeared (it seemed almost to stagger!) over the cliff edge and I don't think I was the only one who wondered whether it would be able to stay airborne - but I needn't have worried (though it must have gone almost straight down as it was several minutes before it reappeared some 2,500ft below and heading away).
Sometimes wonder what the radar sites are like these days.
STH