I recently installed a Cobra 29 ltd classic and a Tram 300 magnet mount antenna. And even on the highway I couldn't get anyone on the radio. The first day out with my setup I lost the antenna going under some low lying trees and now I'm wondering if it's worth it to get another one. Did the cantilever extension on my ladder rack cause interference or is there something wrong with the radio, antenna or the tuning of the radio?