Any other suggestions welcome! (Using a WAG200G broadcasting across an outside alleyway to this 'problem' back office area).
I completely disagree that wires are on the way out when they're outperforming wireless 15:1 in my setup, gigbit LAN, wireless G and N, laptops are G so get 25mbps yet wired will rock 400mbps (using monitor program to see actual data throughput). For internet gaming and streaming video the wireless desn't cut it.
My house is networked to my neighbour's via underground cat6 and mine is then networked to another two houses away using 2 wireless units to bridge. I'd say security is more of a worry at the wireless end, even running WPA-PSK, MAC filtering, and no SSID broadcast - a determined hacker can still get in through the wireless but good luck trying to get on through the wired section without breaking in to a house which is highly pointless.
Also, given that houses inheritly have walls, getting strong wireless signals through them is never going to happen, so internally connections are fine, but you try bridging two houses 70m apart, the end result is having to spend $$$ on decent equipment. If only we were allowed to run a cable under the road, would've been far cheaper and more reliable.
Sorry if this is going OT.
This gives a maximum transmit power (Radio and Antenna) of 160dBm - or 6.5x the power.