Aerial mast base

[Bruce Parker (RIP)]

B sets were a 1000 yard VHF system for inter-vehicle communication and were not very good. Even under ideal conditions a good bump would knock it off frequency. The worst part was that the control unit had to be manually switched from the A set, to the B, to the intercom. All too often the crew commander would make some nice transmission to HQ about progress, then turn on the crew calling them nasty names, yet forgetting to switch from the A set to intercom only.