How do you site survey from a bridge at home ?

a hypothetical:

Suppose you have a bridge on the roof with an antenna connected to it, 
perhaps with some kind of directional rotor. From the bridge to a computer 
inside the house is a wired ethernet connection. (And there are no laptops 
to take to the roof.)

Is it possible somehow to do a site survey for wireless networks in the area 
- using the bridge?

All I've ever seen is the site survey utilities that run via a wireless card 
on a laptop.

Alternatively would it be necessary to use a wireless card on a board to do 
this instead of the bridge?

Thanks,
Kent


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