re: HF slot antenna for the C130
Thanks for the link, RR. That same Brit ex-pat, Ben Hornby, consulted with the inventors of this antenna. It must have been his last project.
They have also built a slot antenna for the 747-1 and -2.
The spec for the DC-10 antenna is nmt 8 milliohms, while for the 767 it was on the order of 35 milliohms. Divide that into 400 watts, and you see the difference in efficiency.