Thanks to those already responded to my question! Some additional information about my setup: I use Aircom+ coax cable and high quality N-connectors exclusively. The total cable run from antenna to my shack is about 20 metres. The antennas are mounted on a fiberglass crossboom about 2 metres apart. Cables from 70cm antenna to polarization switch are about 3.5 metres long. Cables from 2m antenna to polarization switch are about 5 metres long.