[gardenfelder]

The parabolic grid antenna in that link does not appear to be available

[aseidl]

You can get by with one designed for 2.4GHz wifi if those are easier to acquire. They were < $50 on Amazon when I did my build a year or so ago.

Just have to flatten the front a bit and push it out by about an inch. I used a short piece of pvc pipe and some zipties.

[xconverge]

Do you happen to be located in CA?