Want to double battery longevity? Turn tx power down to 2W, and use a Smiley 270 or Diamond SRH-320a antenna.
If you are not making it line-of-sight FM voice with 2W, odds are you won,t with 4-5W.
Want to increase battery life even MORE? Use an earpiece or mini-boom mic!
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Clint Bradford K6LCS
http//www.work-sat.com
Clint Bradford