I'm working on a portable setup currently a dual radio setup with tripod mounted V and U band antennas...and I've got a few questions for the group: should I take the expense to make the coax runs out of lmr 400 or will rg 213 be effective enough? and my second question is about uhf receive preamps are they worth the time and money to put one into the system. oh and btw I plan on using this for both linear transponder birds and fm birds -Steve VA3SAX