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If you are making the loop for a single band such as 11m, I suggest a rectangle shape. Two oppossing sides are twice longer than the other two sides. Fed in the middle of a short side and you have a direct 50 Ohm impedance match to your coax.
For example, a CB rectangle loop antenna has two sides that are approx. 12' long, and the other two are approx. 6' long. Coax feed it in the center of a 6' side.

I have had an 11m wire loop in my attic for several years just for fun. It works surprisingly well.

[QUOTE="HomerBB, post: 754285, member: 8569"] If you are making the loop for a single band such as 11m, I suggest a rectangle shape. Two oppossing sides are twice longer than the other two sides. Fed in the middle of a short side and you have a direct 50 Ohm impedance match to your coax. For example, a CB rectangle loop antenna has two sides that are approx. 12' long, and the other two are approx. 6' long. Coax feed it in the center of a 6' side. I have had an 11m wire loop in my attic for several years just for fun. It works surprisingly well. [/QUOTE]

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