We're talking about a 'CB' antenna, correct?
For all practical purposes I just got one of those small Hustler 'magnetic' mount antennas and placed it to the rear of the front hood, driver's side of my Class C Chevy chassis. Ran the cable into the engine compartment, through the driver's fender, coming out of the driver's door hinge area and onto the interior dash underneath the dash mat.
Radio reception and transmission is much better than I had anticipated. Works for me, and no holes drilled.