Only get 3.5Mbps internet over airport, should get 7Mbps

I have a 600mhz G3 slotloading iMac with the original airport card. When we got a cable modem a few months ago I got an airport extreme base station to network. My wife and daughters powerbooks can't hold the signal and my iMac only connects at 3.5 Mbps according to download tests at the cable company. My wife's powerbook (now connected to base station with ethernet cable) tested at 6.99 Mbps. The iMac gets 7 Mbps when wired.
What's up with airport?
Things tried: Move base station; Change channels; Reinstall older extensions; Wear hat made of alluminium foil...
Are there any other suggestions out there?
imac Mac OS X (10.4.8) keeptomyself

Hello R.W.R.,
Welcome to the Apple Discussions!!!
Wear hat made of alluminium foil...
Wrong hat. It must be made of stainless for this to work (I use my wife's collander, the holes match the ones in my head).
Do you have any cordless 2.4 MHz phones?
In my particular case, my Airport signal is weaker due to having lathe and plaster walls in a brick house for my Powerbook (the Mini is near to the AEBS so I get full signal for it, the PB only gets about 50% signal in the next room).
Have you tried power cycling the cable modem (remember to wear the right hat)?
Are you running OS 10.4.8 or 10.3.7 (change in your specs)?
Jeff
Mini 1.25, 12 Al PB 1.5, PTP 250, WS PB G3, 3xiMac 400 (OS 9.1) Mac OS X (10.3.9) Wireless KB/Mouse, AEBS, 80 GB OWC FW HD

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Apple Discussions!
Suggest that you cross-post in the AirPort Forums
BTW: Typing in caps is considered shouting in cyber space. We can all hear you. Also, it's very hard to read.
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cdelahoy, Welcome to the discussion area!
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