What is the approximate length of the reflector element of a Yagi antenna for 28.1 MHz?

To find the length of a reflector element for a Yagi antenna, first determine the wavelength. The free-space wavelength for 28.1 MHz is roughly 10.68 metres (300 / 28.1). A standard driven element is a half-wavelength, which is about 5.08 metres long. In a Yagi antenna, the reflector is placed behind the driven element and needs to be about 5% longer than the driven element to properly reflect the radio waves forward. Adding 5% to the half-wave length gives us approximately 5.34 metres. A quick rule of thumb for calculating the length of a Yagi reflector in metres is 150 divided by the frequency in MHz (150 / 28.1 = 5.338). The distractor 10.68 metres is the full wavelength, and 2.67 metres is a quarter-wavelength, both of which are incorrect for a Yagi reflector.