I don't use cantennas because they use radial polarization but the huge majority of APs use vertical polarization. That difference in polarization causes a significant loss of signal. Actually my antenna is a 1mm wire stuck in the focal point of a 1mm thick aluminum foil parabola which I pressed using a wooden mold. It looks much like the cardboard+tinfoil parabolas for home routers that you find online, just more professional.
I think not.
Using openwrt it is perfectly possible to connect to your borrowed wifi and distribute it to several computers. Some APs have a separate radio for each antenna, which might permit that. But the most common setup is one computer connected to the AP directly.
Actually, I have a beaglebone configured as firewall between this computer and my borrowed wifi, its main purpose is to filter strange and malformed network packets before they reach the main computer. But such setups are up to you.
Yes, it is. But you don't want to do three things:
1 - You won't access things of your real self through this connection;
2 - You won't distribute a wifi signal locally;
3 - You won't use it too much so you do not upset your neighbor;
The first one is quite obvious, if you are in doubt you should not even be here in 8ch.net in the first place.
The second one is because wifi works like a light, it blinks in your neighbor, it blinks locally. Locally you only want to use shielded cat5 cables, whose "blinking" cannot be detected by an investigator walking the neighborhood.
The third one is a matter of respecting the resource that belongs to another person. My beaglebone limits my bandwidth to 10% speed of the tested amount. I also don't do any heavy downloading. It is mostly for web navigation, news, ssh, shitposting, stuff like that. Stuff to enter the mind, not computer maintenance.
When I want huge bandwidth (a few hours once a week), I haul a laptop to a college nearby which has gigabit anonymous outlets in a sekrit room. From there I update repositories, run torrents, etc.
These three rules of mine came about by personal experience. I suggest you follow and improve upon them.
Get to my level, (((shill))):