how to span a 100m gap

i need to span 100m no repeats and building to building , what the best way to do this , do i need new antennas and will i get away with using domestic equipment, whos the best manufacturer for this and will cause the least problems, other solution is fibre which i don't fancy and i cannot use cat v as the duct has electric cables.

you could probably use a couple of panel antenna's like this:



As for manufacturer/supplier, it depends on where you live. Probably best to go with a local supplier.

are they external?

yes, they're external, you'll probably need a couple of access points that can act in bridge mode (i think) and that have detachable antenna's and what's called a pig tail (something that connects from your access point to your external antenna, often changing the plug type).

i'm thinking of a couple of linksys wap54g s what do you think shoud it do the trick and be reliable.