So I bought the Linksys Compact Wireless-G Broadband Router WRT54GC and the range on it is not so good, but it does have a connector to attach an external antenna.

I was wondering if anyone has any experience in terms of

1) how much gain is typical for a stock antenna that comes with netgear, linksys, d-link devices. 2.5-3db?

2) anyone know of a cheap place to order on-line?
say this place?
http://www.radiolabs.com/products/an...ibberduck5.php

3) how about brick and motar? does microcenter or fry's have these? what about radio shack?

or if anyone has replaced their stock antenna with a better performing one, I'd be happy to trade for the old one