What is the function of this piece?

[Axle]

Originally Posted by mongocanfly

Never would have guessed the hood as a antenna..you the man Keith..

The hood is part of the ground plane, if its floating with respect to the other body parts the radio reception will get funky in one way or another as you travel. Think CB antennas, best spot for the antenna is dead center of the roof, provides the best reception/transmission for the antenna to radiate in all directions, vs mirror mounted antenas, or bumper mounted antennas where the ground plane only exists in one direction, rx/dx will favor a specific direction based on where the ground plane is.