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Attached is a copy of cross polarized yagi's (aka, circular polarization). Figure 12-3 shows the harness is made from one type of cable (i.e., RG-133).  One side of the harness is 1/4 wave of RG-133, and the other side ie 3/4 wave of RG-133.   Everything is connected with a tee connector.  The main feedline is standard 50 ohm coax.  (This is a coy out of the ARRL 1974 Antenna Handbook).