Bizarre wireless networking behaviour

[jammin606]

I've been running a wireless network for a while with very limited success, I'm experiencing intermittent connection drop-outs and poor speeds for no obvious reason.

This is now my third ADSL modem and router (first two were Linksys, the latest is a Belkin), the previous two worked ok for a month or so before performance degraded and this one is now doing the same. I've tried positioning the router in various locations around the house but there's no position that provides a permanent solution.

I've tried using a variety of devices to connect to the router, PC, G5, macbook, apple tv, iphone 4, HTC 7 pro windows phone, and they all behave in the same way.

It seems as though performance drops off when the device is nearer a window, but not exclusively, and the house is in a close of 20 widely spaced houses on the outskirts of the city. I've noted that there are other wireless networks in the vicinity, but I've never experienced these kinds of problems in any other urban environment, and this one is semi-rural.

Any suggestions on what I can do to find a resolution?