Why can I see other peoples' WiFi networks but not my own?

This is a problem that started when an engineer came to replace our TV's set top box as well as our router a few weeks ago. I'll run through everything in quick bullet-point form...
-My flatmates are able to see and connect to our network with no issues at all on their XP laptops.
I, on the other hand, can not see or connect to our network at all. However, I am able to see other WiFi networks.
-Days of rebooting and replugging the router, my iMac and AirPort card prove fruitless.
-Throughout all this, the router is sat on top of the set top box, which is sat on top of the TV. I move the router down so its sat next to the TV and a plant. I'm able to see and connect to our network with no issues.
-Three weeks later, the problem has returned. I can't see our network but my flatmates aren't affected.
-Thinking it may just be poor reception in my room, I set up my Mac in the front room a couple of feet away from the router. I detect other networks, but still not my own.
-More unplugging and rebooting later, hallelujah, I can see and connect to our network. I take the Mac back to my room and try from there. No luck. The familiar XBoxLive8973498374, BT-HomeHub8934897, TalkTalk439847 (etc) and Sofia networks come up in my networks list as usual but not our own SpeedTouch459873439847 (etc).
We have a Thomson ST 585 router and I have an iMac G4 with the original AirPort card. Short of buying a new router, does anyone have any ideas as to why this is happening and how to fix it?

This is what MacStumbler sees when my Mac is situated a couple of feet from the router in the front room:
http://farm4.static.flickr.com/3051/2308676274_00f5eba51c.jpg?v=0
Our network is the one labelled SpeedTouch. As you can see, my AirPort antenna seems to be working perfectly. However, the SpeedTouch connection (and only the Speedtouch connection) would be lost intermittently for several minutes at a time.
This is what MacStumbler sees when my Mac is in my room:
http://farm4.static.flickr.com/3184/2308733380_dcdc2faccd.jpg?v=0
The SpeedTouch signal strength is obviously not as strong but still reasonable. I don't seem to have any issues anymore; I can see, connect and stay connected to our network with no real problem - but I haven't changed any settings on the router.

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