I'm building a long range wireless link between two buildings a mile or so apart. Whilst the initial tests were good I didn't get quite the margin I wanted to account for atmospherics, interference and other crap that could affect the reliability of the link. The whole thing has had to be done on the cheap otherwise I'd have bought proper ruggedised outdoor equipment, instead of indoor kit in tupperware boxes. The WET11 is more popular and hackable than the access point it connects to. So beefing up one end only should actually work well.

EDIT: The pictures of the last test are here