When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?
Why A Beverage is a traveling-wave receiving antenna: a long wire strung close to the ground (often just a few feet up) that picks up the tilted wavefront of a low-angle signal arriving along its axis. For the wave to build up usefully along the wire, the wire has to be electrically long, at least one wavelength and typically one to several wavelengths for good directivity and front-to-back ratio. That is why Beverages are practical on 160 and 80 meters, where a wavelength of wire is a few hundred feet, and why they are receive-only antennas with poor efficiency.
Watch out The choices calling for a quarter wavelength or a height of more than a wavelength invert the design: a Beverage is deliberately mounted low, near the ground, and is long, not short. A four-sided loop describes a quad element, a completely different antenna.
Beverage = Bee Line: Big and Low. One wavelength or more of wire, just above the ground.