Since getting my new Intel Mac Mini the signal strength to my computer has been very temperamental. The connection will go from strong to weak very suddenly and sometimes lose connection altogether. I've tried changing the channel that it is broadcasted on from the router but it has had no effect. I've also used various programs to check for any interferring signals. Neither do I have anything sitting on to of or above the Mac Mini. I'm at a bit of a loose end here especially as my dads Powerbook seems to get constant full signal while sitting near my Mini and the imac just outside the room gets constant full signal. At first I thought maybe it was these computers that were interferring but I've tried it with these turned off as well.

Any help would be gratefully appreciated.