I work for a company that installs Cisco equipment and was told that the maximum distance for optimal performance is to have the antennas no more than 5.5 inches and up to 20 inches apart. Is this statement true or false? I normally mount the 1242 APs in the center of a 3 foot board and connect 2 2.4GHz antennas, each one tied to opposite ends of the board (pointing down), with about three foot between max. The antenna is then mounted at ceiling height. I've never had anyone complain of having problems with the AP signal and I've never heard of their needing to be a specific distance between antennas. Also, could someone explain to me why two antennas instead of just the one.