directional 3rd party ones are your better bet, but again remember the higher the dBi the better, its generally worked out as, for every extra 3 dBi, you get almost twice the distance on line of site, and around a 3rd extra power inside.
these seem to work fine for me on one end, if you put one one each end (assuming a router and a single PC/laptop) and point them at each other then you will get far better power levels
http://www.cableforum.co.uk/board/87...l#post34259377
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you can also buy or make yourself a simple wireless reflector and place them on your current wireless router arials and point them in the direction you want to go.
i also find all wireless routers iv had, are best positionad as high up on your room/building as possible for best coverage, i for instance have mine upstairs and the downstairs PCs seem to get a far better power rating that way rather than when the routers on the same ground level.
if you have steel reinforced concreate floors then it might be a problem, but its far easyer for radio to travel through plasterboard and wood floors, than brick walls.
http://www.usbwifi.orcon.net.nz/
i had a URL for some very nice and cheap commercial set of small wireless router reflectors but cant seem to find it right now so just use some card and a coke can as per the above for cheap
---------- Post added at 02:39 ---------- Previous post was at 01:28 ----------
"I have experience of their NET-WL-ANT-015ON (or something very similar) on the end of ~10m of their very fat cable. This allows coverage of a whole factory."
given the cost of that 30foot+ lowloss cable plus the big dBi loss you get from the
pigtail (the bit that converts from the big end cable connector to the small wireless card connector) it sounds like you would have been better and cheaper just puting the wireless router with the high gain arials up there, and running a RJ45 Ethernet cable+ cheap POE converter down to your PC.
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