If you made a half-wavelength vertical antenna for 223 MHz, approximately how long would it be?

To find the physical length of a half-wavelength antenna, first calculate the full wavelength using the standard formula: Wavelength (in meters) = 300 / Frequency (in MHz). For 223 MHz, this is 300 / 223, which equals approximately 1.345 meters, or 134.5 centimeters. Since the question specifically asks for a half-wavelength antenna, divide the full wavelength by two. Dividing 134.5 cm by 2 gives you roughly 67.25 cm. Therefore, the closest correct option is 67 cm. Common distractors in this question represent other fractions of a wavelength. For instance, 135 cm is the full wavelength, and 32 cm is a quarter-wavelength. Always note the exact fraction requested by the question to avoid choosing an incorrectly scaled measurement.