As a point of interest, here's some data on three Soviet/Russian radios used for platoon & company comms.
R-126 Used 1966? to 1980s Wt: 2.8kg Range: 1.5m blade antenna 2km; long wire 4-5km
R-352 Used 1960 to 1980s Wt: 2.8kg Range: 1.5m Kulikov antenna 3km; ling wire 6-7km
Both these sets are about the same size and both use vacuum tubes and/or pencil valves
R-392 Used 1980s+ Wt: best guess 3kg? Range: Kulikov antenna 10km; long wire 25km
R-392A Used 1980s+ Wt: best guess 3kg? Range: Kulikov antenna 10km; long wire 25km
Both these sets use crystals rather than vacuum tubes so it could be argued that the range increase doesn't increase the weight due to the savings from changing from valve to crystal technology?
If you're interested, this site (while a pain in the rear sometimes) features plenty of radios from around the world
http://www.radiomuseum.org/