MAC MINI- Airport Connection cutting out regularly

MAC MINI- 10.4.11 1.5GHz intel core solo
My mac (above) keeps losing airport connection (to my BT homehub router-which is newish)- Has been running fine for years-changed my router-was still running fine for a few weeks AND NOW....keeps cutting out wireless signal for no reason. I have other macs/comps on same signal (nearer router also!) which are unaffected-only mac mini is... I have tried everything I can think of and been on forums etc all day...
Cuts out-won't recognise my router- then after a restart it sometimes comes back on-sometimes just comes back on itself after an hour or so also.... When its on, the signal gradually loses strength till it gets to zero-then disconnects and won't recognise any wireless devices (it usually lists a few that are in my building)....SO- router is OK as other comps are fine- it must be mac mini fault- have had no software updates recently either-so really don't know what to do next! help!

Hi,
thanks for your reply-I have tried every channel possible (before posting my first post)- but like I say -it connects fine at first (sometimes-especially if comp has been shut down overnight)-then after about 15-30 mins the bars start dropping and then it goes and won't come back on... I know it is not the router as my other mac (which is further away from router and also is a much older computer) has never had any problems like this before and doesn't have any while the mini is disconnecting..
I have tried everything I can think of and have spent hours and hours reading through other similar posts- but can't find anything that works....
If the mini macs have a weak antenna then why has it been ok in connecting since I bought it (was one of the first mini's to come out) ? Do you think it gets weaker with age? Why is it ok for a bit then disconnects,then is ok, then is not etc etc ??
Thanks for your help anyway-any other suggestions you may have would be greatly appreciated as I am about to throw it out the window!!cheers.

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