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trying to make the half mast with the usdm antenna... im not sure about it... try at your own risk (should not damage it)
relay (open/close antenna)
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85 -- yel/wht - 12v from radio
86 -- grn/red - from switch - gnd unpushed, none pushed
30 -- yel/wht - 12v from radio
87 -- yel/wht - 12v to antenna (full open)
87a - yel/wht - 12v to antenna WITH A RESISTOR (should do a half mast or something like that)
V=I*R.... i calculated 6ohm assuming that it have 2A and 24ohm assuming it have 500mA
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