Sat what you want.
The limits of radio technology are well understood.
There are more commercial $$ chassing the next advancement than there are millitary $$.
Sure the military has stealth, only because there is not commercail use for it.
The SR-71 went away not because it was replaced by a new plane, but because it was replaced by Satelites.
Almost all military aircraft will be "Low Observable" (stealth) that is just teh evolutiona of the breed, but the F117 did not go public because it was replaced, only because it crashed so much.
Back to radio, I am sure your old radios had plenty of range for the mission, but if you did not know much about them, then you have no way to know how they got the range. Don't worry though, it was plain ordinary technology. Nothing too special.