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there's several things with wirelss
if you have the old G version, 1 antenna, they have issues if not line of sight and signal strength, eg wall thicknesses and type.
The N version either 2 or 3 antennas has longer distance, not due to power, but because it can calculate the signal by the differences in the received signals. So N gives you speed and distance under the right circumstances. I use antenna extenders, it's a base with connectors for 3 antennas and 1.2 metres of cable, can be used by the base or pc card. Edimax is the only one readily available, $31, although there are others.
This will give you flexibility to get a strong signal by placement, eg kitchen window antenna, kitchen bench for the base, and in the obsevatory you can have the pc where ever you like and place the antenna closer to the line back to the house.
Also one of the band used coincides with the microwave oven, so avoid that one if the base is in the kitchen, hence the move to 5ghz from the std 2.4ghz.
I'd go wireless because it's a pain bury 20m of cat 5 or 6 cable, and then the connection point in the house.
Wireless n would be up and running in an hour, and you can add extenders to well extend the network if you you have a weak signal along the path from the eg front of the house where the access point is to the back of the house (extender at back, another access point).
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