A simple loop antenna, tuned with a variable capacitor, makes a fun project that improves the performance of AM broadcast radios. You can experiment with the number of turns and size of capacitor to find various resonant frequencies. Other types of variable capacitors and construction techniques are of course possible. There is no need to use a hula-hoop and no need to make the loop circular -- smaller square loops with various numbers of windings also work great! Have fun, de NG9D . .
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