A tractor comprises a tractor frame, driven ground engaging means, and an electronic tractor controller. Thus, appropriately shielding ourselves from the sun has become ever more important. The method further includes the steps of combining the frequency shifted satellite signal with a second satellite signal of the plurality of satellite signals and modulating a optical carrier with the combined signals, transferring the modulated optical carrier to a receiver through an optical fiber and decoding the first and second satellite signals within the receiver.