Only thing I could find on Newegg (quick search) was a 30 dollar, 6 dBi patch. I assume when you say gain 4 dBi, you understand you'll lose whatever your using now, which is usually a 2 dB omni. If that's the case then the one I was looking at maybe the one you were looking at. It's a patch, with an 80 degree beamwidth but it is still directed pattern. Should be plenty. You probably would only "need" to put it on one side though buying one for each side of the link would be better. If your association is intermittant or just weak now with your default dipole's, then the newegg solution, at 6 dBi would clean you up. Doesn't have to be 8 dBi or better to be "decent" at all. Even if you have the same gain that you have already, if you direct the pattern your going to get better reception, so any "gain" in antenna "gain" is a plus. HD or fabcorp sell solutions with similar pricing. Last time I checked anyway. As far as omni or directional. If you only have the two devices, then directionalsis what you want. Might want to stay omni on the AP and just get the directional for your client side. That will give you 360 degree coverage at the AP and give you client addition options. Link the newegg link if you want but if it's a directional and even 4 dBI, as long as it's a directional, it will help.