We are installing 1260 Access Point (AIR-LAP1262N-E-K9) with 2 sets of external antenna:AIR-ANT2460NP-R (2.4Ghz, Patch Wall-mount, 6dBi Directional) & AIR-ANT5160NP-R (5Ghz, Patch Wall-mount, 6dBi Directional).What would be the recommended separation...