SMA plug connector with four post PCB mounting. This hard-to-find male connector will mate with a SMA jack.
The popular Do-it-Yourself
Goof-Proof Patch antenna project uses this special connector. If you've been looking for it then your search is over!
Please note: Construction details to this great performing (and easy to build) patch antenna are found here:
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Link permission to the GP Patch project was obtained from the project's author.