My question to you guy is, that after i bought this one, I thought that it would be hard to operate in full duplex mode as i almost get cross talk on the 70cm side.
Polarization is not the only thing to consider. There's also wattage, feedline arrangement, and receiver quality.
I'm using a Cushcraft which has the 70cm alongside the 2m elements. For FM, I'm running 75 watts xmit on 2m. With the default feedline which consisted of two 3foot segments teed to a length of RG-58, I was getting a lot of desense on transmit. I changed to seperated feeds of higher quality coax, and now am running full duplex just fine.
I haven't been able to run full duplex on AO-7 yet though. That setup consists of the same antenna plus an FT-817 for rx and transmitting SSB at 5-35 watts from an IC7000. I get crosstalk in the FT-817 even at 5 watts xmit from the IC-7000.
Scott NW2S