What is the approximate length for a 1/4 wave monopole antenna cut for 28.5 MHz?

For a quarter-wave monopole antenna, the formula to find the length in feet is 234 divided by the frequency in MHz. This is exactly half the constant used for a half-wave dipole (468). Dividing 234 by 28.5 MHz yields approximately 8.21 feet. Rounding this to the closest whole number gives 8 feet. The 16-foot option is a common distractor representing a half-wave dipole for the same frequency.