Darrell, et al:
The pic you show doesn't seem to have the spike to stick it into the ground.
That notwithstanding, I'm fairly certain that this remote antenna item was compatible both to the PRC 510 as well as the PRC 25/77.
The antenna section screw in part at the top looks to be the correct thread size for both applications.
Weird colour though.
PS...After a bit more research in the manuals, I'd definitely say that the origin of this remote unit came from the PRC 509/510 family. I further believe that it was found to be compatible with the PRC 25/77 family, although I'm not entirely sure since I only operated the PRC 25/77 when it was installed in the amplifier tray in the VRC configuration.
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PRONTO SENDS
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