Ebay    Drive on CAR TIRE ANTENNA HOLDER FOR HAM RADIO MILITARY POLES ALUMINUM FIBERGLASS

This is a very quick way to give extra height to your antenna while Mobile/Emergency Ops. 

http://www.ebay.com/itm/ALL-CAR-TIRE-ANTENNA-HOLDER-FOR-HAM-RADIO-MILITARY-POLES-ALUMINUM-FIBERGLASS-/191283942532?pt=US_Radio_Comm_Antennas&hash=item2c89695484