So I recently installed a new yaesu 2900 and larsen nmo150 antenna in my truck to monitor two meters and some utility frequencies. It seems to work good except on certain frequencies it picks up a lot of noise and on others it doesn't. This radio has a squelch knob which helps eliminate the noise but sometimes I turn it all the way up and it's still making noise. I installed the radio and antenna exactly as per installation instructions. Also it doesn't matter if the truck is running or not. Has anyone here experienced this before or have any suggestions on how to fix it? Thanks