Actually that implementation by binman was one of the first ones I was given pictures of. There is at least one other camera that I've seen fitted with the reflector.
The one at David's site is just a really nice implementation of the design. His numbers show about two dB more than your classic "cantenna" but then he built an 8 inch reflector.
I can't figure out how to add the neon lights but I *AM* working on it.