ANY of the advertisers, here on QRZ can sell you such an antenna.
$10 buck item or less for a 1/4-wave NMO mount mobile antenna.
Used antennas are often found in junk piles at auto body shops, junk yards, land mobile shops
Alltronics sells a 900 MHz antenna that you can use a longer whip for 70 cm
these can be found at their Santa Clara, CA store OR on eBay.
Part number: 97A005
Last edited by W9GB; 04-05-2012 at 09:12 PM.
We keep moving forward, opening new doors, and doing new things, because we're curious and curiosity keeps leading us down new paths. -- Walt Disney