Biquad antenna reflector design: Does it need to be a groundplane or float?

I am unclear from the various designs put out on the web. To me it appears that if the reflector itself is connected to the coaxial cable, it then becomes a part of a semi-dipole that now forms between the 2 antenna terminals. One leg of the dipole is the reflector and the other is the other signal terminal. So we have a case of a biquad and this qasi dipole being in parallel?

Reply to
Sudhir Brahma
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Nope. Two random twisted pieces of metal do NOT magically make a usable dipole antenna. The biquad is basically two full wave loops in parallel, with a reflector behind it. The reflector is usually grounded to the coax cable shield, although it will work equally well if it were floating. For example, this reflector is not grounded and works acceptably:

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Reply to
Jeff Liebermann

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