Originally Posted by phoshizzle88
depends on your head unit.
Yup, it's determined by the headunit.
On mine (Alpine CDA-7998), when TUNER is selected and the tuner band is set to AM, FM1, or FM2 the antenna goes up. When TUNER is selected, but the band is set to XM1 or XM2 the antenna stays down. When CD or CD CHANGER are selected, the antenna stays down.
You could always put a switch on the power antenna activation wire.
I have no idea what's up with your radio.