I'm drilling a hole in the (steel) roof of my car for an NMO mount. NMO mount came with RG8x which I have fished through the headliner and down the rear pillar into the trunk. I have a stack of antennas to experiment with and am ordering a transceiver. 70cm - 1/4 wave 2m - 1/4 wave 6m - base loaded 48" whip (simple series loading coil) 10m - base loaded 48" whip (loading coil grounded at one end and fed somewhere in the middle) I will run separate radios for 70 cm, 2m, and HF. 50-100 watts depending on band. I am thinking that I should insert a current balun in the feedline to keep the RF out of the car. I have some questions: * Is this a good idea? In other words, will it make for a more reliable, trouble-free installation? * Will I need separate baluns for each band? * What balun designs make sense? * Are there any balun designs that can utilize the RG8x or will I have to switch to a more flexible, more heat resistant coax for the balun?