Wireless Extender kills my internet connection

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I currently get my internet connection from a friend in the next
village. We have a couple of 802.11g AP's with directional antennas to
send the signal from his house to mine. The AP at my end then goes
into a Linksys Router, so that my network is seperate to his. From my
linksys Router I have a netgear ME102 AP for my wireless lan in the
house. Unfortunately the signal doesn't reach to all corners of my
house so I bought a DLink DWL-G710 range extender. This seems to work
well with regards to repeating the signal from the Netgear AP.

My problem is, after about 5 mins of use, the internet connection dies.
I can still connect to all machines on my local network through the
extender and AP, but I think the DWL-G710 is interfering with the
Wireless connection to my friends house. His connection is on channel
6 and mine is on channel 1.

Any help will be appreciated.