NEWBIE ALERT

I'm very new to this wireless stuff and have never played with radio
equipment beyond Citizen's Band (CB radio), but I know enough to have a
couple questions about the range of 802.11b.

What little I have read about 802.11b and its counterparts (e.g. bluetooth
wireless) discusses effective ranges of 10-100 meters.  My limited
experience with my Linksys Prism2.5 card confirms this range.  How is it
that people on this list are discussing ranges upwards of 23 miles?  Perhaps
the stuff I have been reading assumes very small antennae?

After seeing the coverage maps of the Twin Cities displayed at the meeting,
I'm left with some confusion.  What good is it to put up a big antennae
backed by a big amplifier and coat a very large area with 802.11b?  Can
people with ordinary WLAN cards in their laptops actually communicate with
the access point?  I can understand how they might be able to recieve data,
but how can they hope to transmit over such a large distance with their
wimpy amplifier and antennae?  Do you need a big antennae only on one end to
make it work?

Mike Bresnahan