I built my bi-quad a few years back and the trickiest thing to tweak on it for max gain was adjusting the feedpoint gap, which I did in real time using Netstumbler. I use it to connect to my garage about 200 ft away, but can also pick up the neighbors wifi from about 800 ft. The way I have it connected to my pci wifi card is via a cheap low loss SMA cable extender, but the usb method will give you greater distance. If I were you, I would just build the simple bi-quad, the double bi-quad is much harder to tweak out. The simple bi-quad also has a very nice bubble radiation pattern to it making it very easy to aim, along with its 10 - 11 dbi in gain, which is enough for most purposes. I would use a usb adapter that has a rubber ducky SMA antenna on it. Ive gotten those for as low as $ 7 on sale. The Rosewill one I got from Newegg has quite good range. I would mount it to the back of the reflector in a water proof box like you proposed (silicon sealant should be enough to hold it) and solder short leads from the feedpoint to the SMA connector. Make sure the leads don't get shorted out. The most basic antenna, the quarter wave, radiates and receives in all directions around (assuming vertical) and has a vertical directionality that is from mostly horizontal (actually best is a bit above) to about 45 degrees (not much goes up) This is basic instructions on building a handmade Double BiQuad antenna for WiFi/WLAN 2.4 GHz with 14. If you want more gain in a cheap setup, then just mount a usb adapter (again preferably one with a rubber ducky antenna) to an old discarded satellite dish. The IdeaWorks long distance WiFi antenna features water-resistant and corrosion-resistant housing so you can mount the antenna indoors or outdoors and not experience interruptions in your connection. But keep in mind correct positioning of the mount and aiming are going to be much much trickier. It also allows you to access WiFi from public hotspots. Homemade double biquad wifi antenna Patch#.
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