Techniques are disclosed to remedy thermal issues associated with antenna systems. These techniques include implementing heat pipes coupled between an external mast having antenna circuitry mounted thereon and an internal heatsink inside an environmentally-controlled location. This configuration thermally regulates heat associated with active antennas mounted to the mast, which is externally mounted onto the roof of a vehicle. The heat pipes carry heat from the mast down through the roof to the internal heatsink. The aspects described herein allow for car manufacturers to integrate mmWave technology into their vehicles while avoiding large and unsightly cooling mechanisms that would otherwise adversely impact aerodynamics and fuel efficiency.