Wireless Network Antennas

What is the best & cheapest way to extend a wireless network 700 ft without using outdoor antennas?

I have a wireless g network that I want to extend to an outbuilding that is approximately 700' away from my house but I don't want to use outdoor antennas.

Public Comments

1. Search for one of those 1-mile routers that were being advertised a couple of years ago...