I have a question regarding wifi speeds. I am buying a wireless usb
adapter for a new tivo and am looking for adapters.

Netgear has a 108 Mbps adater, but I was trying to do some research to
find out if that is a marketing gimmick. I had thought that 54 Mbps
was the maximum thruput, but I was reading on cnet that 802.11 g specs
are:

20Mbps 150 feet range.

How can wifi g adapters give 54 or even 108 Mbps? Is this done through
duplexing?

They say it's compatible with any wireless g device, so I don't think
they're using any kind of proprietary boosting technology.

Any info would be helpful and appreciated.

Thanks,

Seth