I need some help - Antenna Warning on SWR Check

Discussion in 'CB Radio Forum' started by HD_Renegade, Jun 15, 2011.

  1. Night Stalker10

    Night Stalker10 Road Train Member

    Jun 26, 2017
    There's nothing wrong with the 102" antenna. But even this antenna may have an efficiency rating of around 70% on 11 meters when properly mounted. This is due to radiation resistance (electrical length not physical) of the antenna. I know that there's a lot of guys who have had to add a 4 or 5 inch heavy duty spring to get the swr reading they were after. I assume the reason for that was due to a lack of ground plane problem, like antenna mounted on rear bumper. Location location location seems to apply to 1/4 wave mobile antennas as well as real estate.
    Last edited: Apr 13, 2021
  2. Meteorgray

    Meteorgray Heavy Load Member

    Jan 1, 2016
    A 102" antenna will often require the ~6 inch spring to get the total electrical length to 108" for resonance.
    handlebar and Night Stalker10 Thank this.
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