Ham Radio General Class Practice Test

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What is the approximate length for a 1/2-wave dipole antenna cut for 3.550 MHz?

42 feet
84 feet
131 feet
263 feet

The correct answer is: 131 feet

The length of a half-wave dipole antenna can be calculated using the formula: Length (in feet) = 468 / frequency (in MHz). For a frequency of 3.550 MHz, the calculation would be: Length = 468 / 3.550 ≈ 131.27 feet. Thus, rounding appropriately gives an approximate length of 131 feet for a half-wave dipole antenna cut for 3.550 MHz. This length ensures that the antenna is resonant at that frequency, allowing for efficient radiation and reception of radio signals. The other lengths listed are not correct for a half-wave dipole at this specific frequency as they do not align with the formula used to calculate the antenna length based on the desired operating frequency.