General › G9 Antennas and Feed Lines › G9B02
G9B02
Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?
Pick an answer to check it.
Answer: B. Slope the radials downward
A ground-plane vertical with horizontal radials has a feed point impedance of about 36 ohms. Sloping the radials downward raises it to about 50 ohms for a better match to coax.
Tip: Droop the radials to reach 50 ohms.