Okay im going to say this because none of you seem to have the ability to see it youselves.
Wireless and more specifically screamer in this case is like an abusive spouse, secretly deep down inside you know they wont change. You want to believe that it will change but you know its not going to.
Stop spending your life hoping the connection is going to get better because it isnt. Just get over it, accept your mistake and move on to ADSL or even 3G. You guys moan about being slow or not even connected at all so often and I think to myself every time, weird im on my dsl line at the moment reading this and having no problems at all.
Its just my 2c, use it - dont use it.
Fine, then come and put up copper at my house and make sure it stays up.