I have a like new Garmin GXM 30 Smart Antenna to fit any Garmin GPS product.

Waterproof

Steel mount to fit bolt housings for Zumo 550 type mounts and others

Navigation
Weather Services
Satellite Radio Traffic
3 inches in Diameter
USB cable (male) plug-into your GPS unit.

Mounted it to my C-14, decided I didn't want to pay a monthly fee for radio I usually don't listen to...have IPOD and smart card in my Zumo for all the music I need.

Paid $250.00 plus shipping

Sell $200.00 PayPal accepted.

Ninja