Jason Gurtz wrote:
Are you sure there's not a moisture problem in the antennae cabling? Get an SWR meter that can handle the 2.4 GHz range and make sure that SWR is very low (approaching 1:1 but certainly less than 2:1). Hook up the meter in-line at the AP. Test this after everything is wet and again when there's been a dry spell. Minimize the number of exposed connections and use dielectric grease.
Alternatively using an antenna with integrated ap like the one's I referred to previously (they have a nice cast enclosure for radio and a screw down bulkhead with gasket for the cable) eliminates the need for runs of rf coax at all and also deals handily with the necessity for an outdoor enclosure for the linksys ap. I would use outdoor rated cat-5 for the run up to the ap.