I'm thinking of building an extremely stable digital video link using raspberry Pi's and two or more diversity wifi sticks for reception. For that, I need a lot of (compact) antennas. The perfect solution for me would be to print two (or even four) CPatch antennas to a single PCB so that it gives a compact 2.4GHz antenna array.

Not sure if that would work commercially, though. But more and more people seem to be using diversity ...