I have two of the RS multi-band mag-mount scanner antennas on my truck. Both of them on a 197 work excellent, but at 70+ mph (I.E. running to fire calls, interstate, etc) my antennas like to fall off...Has anyone tried adding any sort of extra magnets to the base to help hold it & still be removable? Or is it possible to switch these antennas to NMO mounts? Just figured I'd ask. Thanks in advance!