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If you place an antenna on a 45 degree angle it's responsive to both vertical and horizontal but you'll also be about 3db lower than if the polarization matched perfectly. If you're off by more than 45 degrees the signal drop increases rapidly up to 20db loss at the complete cross polarization point. You'll still get the same 20db drop in skip when the polarization of the signal is at the exact opposite 45 degree angle.


Using the 75 ohm co-phasing cable and combining them both together is just vertical and horizontal together. Adding the 1/4 wave, 90 degree phase delay line converts dual polarity into full circular polarization. That makes your signal resistant to all polarization shifts in DX. There is no cancellation of the signal as the two combine together in the far field as CP.