X3 for the manpack RTF100 in 51FNQR.
More reliable than a sat phone (with a half competent operator) as long as someone is listening back at BHQ!
We used the f1 until '92 iirc. Occasionally used UHF to be shady as well.
The F100 kit was very flexible and combined with a patrol sig cse the only limiting factor I found was crappy freq allocations and a 'dynamic' ionosphere. I used fences as very long listening wires, M18/ Don 10 wire dragging out the back of moving vehicles in sky wave and a few other tricks. There was also other stuff used for data TX that helped in poor conditions.
It was only years later that I found the manufacturer prohibition against 20 watt TX within 6m of anyone. Occasionally did that from my back while patrolling! Still managed to make 3 kids though

If you want to create an authentic display on the cheap, just get an AusPack and stick a 3m (note: NOT 10') whip out the top. The purpose built sig pack came in about '93. Well designed, but you know what they say, the bigger the pack, the more crap you take bush. Used one a couple of times then went back to the std pack and starving a little. That wasn't a problem. When I first joined, I carried an F1 and golf bag in the VN era AusPack mk1! Occasionaly I even carried a ration pack

Cheers.