Hey I picked up a twin pack of uhf uniden radios that are supposed to be able to go 4kms. They came with earpieces and voice activation. But when I tried them in practice with chris from the forum, they were crap. Voice activation worked sporadically, and when they did the first 2 seconds were cut out. Wasn't loud enough, too much background noise. 90% of the time they plain out didn't work. Just wondering if other people successfully use radios? If so which ones? The pair I got cost $98 down from $128 all up.