  Providing RHCP and LHCP outputs from the antennas vertical (V) and horizontal
(H) dipoles in the resonant cavity within the antenna feeds is the current
practice of ground-based station receivers in aeronautical telemetry. The
equalizers on the market, operate on either LHCP or RHCP alone, or a combined
signal created by co-phasing and adding the RHCP and LHCP outputs. In this
paper, we show how to optimally combine the V and H dipole outputs and
demonstrate that an equalizer operating on this optimally-combined signal
outperforms an equalizer operating on the RHCP, LHCP, or the combined signals.
Finally, we show how to optimally combine the RHCP and LHCP outputs for
equalization, where this optimal combination performs as good as the optimally
combined V and H signals.
