150 ft is really far for 2-way and very poor design. You could try a 3x with multiple WAPS but you had better be very good at setting up roaming on a wireless network. I'm not even sure the 6x has this range but you could try 2 gateways with the single panel linked to both gateways.
Bottom line is you're pushing at the limits of 2 way reliably.
Alan
"This is a Christian Country,Charlie,founded on Christian values...when you can't put a nativiy scene in front fire house at Christmas time in Nacogdoches Township, something's gone terribly wrong"
