) Those first 2 measures will keep people from using your internet. However to portect the data that is passing between wireless device and router you have to enable WEP, or WPA-PSK. That is an encryption key that encrypts the data that is sent wirelessly. I haven't had any reliability issues with my netgear, but havent used linksys or other brands.Quote from just21:
Get a linksys wrt54g, change the linux opensource firmware with http://www.hyperwrt.org/ and then put on a new aerial from ebay. Should be able to cover your entire block.