Yeah I already knew the Hall Effect Sensor was a line of crap. However what I suggest you give a try is is remove the Negative of the radio from the battery term post, shorten it and terminate on the Chassis hard point. Under the dash or under one of the kick boards on either passenger or drivers side. There are two good reasons for doing that that revolve around Equipotential Ground Plane. 1. Should make the Negative return DC power path lower resistance which results in lower voltage loss thus a few more watts on TX. You want to limit voltage losses as much as practical. 2. A Equipotential Ground plane significantly reduces impedance between any two points on the Ground Plane. So all the gizmos and gadgets have the same exact reference point which reduces/eliminates noise. In other words reduces interference between the various sensitive electronics used in modern vehicles. It may or may not be noticeable, but no harm in trying.