Chapters 6 and 8 of the ARRL antenna book 21st edition has the 1/2 square:
It's two vertical 1/4 wave sections and a 1/2 wave top.
Fed at the corner of 1/2 and 1/4 wave sections is a low-impedence current feed point, or if fed at the bottom of one of the 1/4 wave sections against a counterpoise it is a high-impedence voltage fed.
Nothing you could not whip up with 4 insulators and some wire and rope. Nothing.
they note that you can bend the vertical section as needed.
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