I have a decent extra
VHF that I what to use as a backup
VHF. I want to make it standalone with it's own discreet 12v
battery bolted to the ceiling and out of the flood/swamping plane. Any tips for something that'll keep the SH vhf running a few extra hours in the event of system failure? I have a handheld vhf already. So I will have 3vhf's.