Here is a handy tool for making odd-sized round holes. It's a pretty messy job I did, partly because I didn't have much time and built the thing in a rush, and partly because I wanted to demonstrate what a rip-off commercial antennas are that even with crude and imprecise contruction techniques and unglamorous materials, you can get decent performance. The whole assembly is contained inside a compact (4x4") plastic food container. Hot melt glue holds everything together except for the N jack, which is soldered on. I'm not sure how good the dielectric constant of cheap plastic pens is, but it's the only thing I had handy last night that's what I used as a spacer for patch and ground plane. I cut all the parts with a pair of tin snips (actually it took me longer to hunt down a screw in my garage to fix my broken snips than it took to make everything!). ![]() I used the lid from a fisherman's friend tin (nasty menthol mints) for the patch and a piece of scrap galvanized steel for the ground plane. I won't go into details about dimensions since they are well documented at the above link. Here is a local mirror: Inside the Comtelco 7.5dBi. (Update 20051106: the site seems to be down. ![]() Below is a summary of my experiences in building the patch Comtelco 7.5dBi patch antenna posted by outcast_one and otaku42 at
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