stupid computer question

[snakehead]

I get to my hotel in vegas, and turn on my laptop. just for grins, I run a site survey on the wireless card. there are several signals, from around 40% to over 80%. I go ahead and connect to the strongest one.

where is this signal coming from? any reason I shouldn't connect to it? how far do these signals travel?

I've been using it for 3 days. it's ok, but not real fast.