One of the worst microsoft ploys IMO, is the so called genuine windows advantage software. It's practically a Trojan, and once installed it is very difficult get rid of it. This thing has even been released as a Firefox plugin that installs and activates without your permission, and has no uninstall facility. The people who write Firefox didn't like that, and sent out an update that turned it off.
No matter how carefully you watch, there are so many things that keep track of what you do in windows it's almost impossible to keep your machine clean. Programs like CC Cleaner show lots of data that most would never guess exists, and CC Cleaner is not that thorough. Firefox leaves trails, too, even after you use the "erase recent history feature". That's probably why they renamed it from "erase private data".
We should probably all migrate to Linus, but every time I've tried there's always been something I needed from Windows that I didn't have, and wouldn't run on an emulator. I haven't tried lately, though. Maybe that's less of an issue now.
What appealed to me about the parabolic antenna was the fact that it took the energy that would otherwise be radiated to outside walls or other areas where it is wasted, and re-focused it in the direction of use. I didn't put a lot of effort into the construction of either, but according to my router I got about fifteen dB gain from the parabolic antenaa vs. about 7 or 8 dB from the cantenna.
The consensus seems to be that you are correct--that properly constructed, the cantenna provides better gain. That makes sense but it's going to be very directional. But directional may be just what you want.
You've got me on the cantenna with USB dongle. I don't know what the hell the dongle is supposed to do or even what it is. It's been maybe five years since I played with these, and I guess I'm behind the times.
Here's a little blurb from the web page on a parabolic antenna. Another thing I really like is that it's make of cardboard and aluminum foil in about ten minutes, and it works pretty well. It's from
http://www.freeantennas.com/projects/template/ It doesn't even need a connection to your router. The author says:
"Advantages over other antennas such as the Pringles Can Antenna
1. No Pigtail Required
2. No Modification to AP (No voiding of warranty)
3. No Matching (SWR) Problems
4. No Purchased Parts
5. Trivially Easy Construction
6. Very Low Probability of Error
7. As Good As or BETTER Performance than the Pringles Can Antenna
8. Superior Front to Back/Front to Rear Ratio
9. Improves Wireless LAN Privacy
10. Reduces Interference
"Basically this antenna is so easy to make, tune, and install, and it performs so well that it is foolish not to try one before electing to purchase a commercial antenna, if for no other reason than you can check to see if you are purchasing enough commercial antenna to make the link you want to make."