Tom, I've never had any rfi/tvi with my G5RV even in very close quarters.
However, you need to make sure all connections are good and have a good rf
ground on your rig. Also, I've fround less problem using a coax G5RV rather
than a plain wire one.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html