It's all elementary, my dear GartFargunkel. Basically, the length of the element is directly prportional to the power of the frequency itself. VHF frequencies, being weaker have the best reception on larger elements, especially telescoping ones. They don't call 'em "rabbit ears" for nothing.
UHF signals are stronger, sharper, and have the best reception on small elements, the basic shape is the short bar, bowtie or loop. Some inexpensive antennas have UHF shape attachments suspended over the VHF elements.
The more elements an antenna has, the better the reception. For tough to receive signals, it's best to have separate UHF and VHF antennas, so there's no interference crossing between the two signal bands. So if you have the space to put it, build or buy a good big one.
For building your own, pant-stretchers make a great base, especially when you're planning to go on a diet. Put large VHF elements on one, and small UHF elements on the other. If you only have the target signals in the UHF band, the VHF sections may be omitted.
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