I am driving a 2005 Mack Granite series truck. It came with 2 antennas pre-wired. Does anyone know what kind of antennas they use? They have the mack logo on them. I want to use a 450 watt amp but dont want to harm anything when I hook it up. They look like the straight wilsons with no coil keg just a straight fiberglass stick. I dont want to replace them if I dont have to. The guys at the dealer have no clue..