weak network strength

Hi,

I have a 6 mth old time capsule which puts out a network to my imac intell in the same room and at he other end of the house (25 metres or 8 yards) my sons imac G5 sometimes has a full signal (on the fan) and sometimes has a low signal and sometimes he cannot connect. About the centre I have 'bridged' an airport express which has not assisted. our next door neighbors have airports - are they blasting us off the air??

should i add a bridge with another airport extreme??

thanks in advance for any advice.

cheers
Maxy

What OS are you using that has issues and are you on ADSL and seems to me that 8 yards is about 7 metres. Used to have 2 older extremes to cover the distance that one of the newer gigabit extremes does easily and that must have been 20 metres.