Answer: The antenna cable length can vary; 9.5" is the minimum length supplied. Each antenna is tuned for the length of cable attached to the antenna; you must not cut the cable or change the cable length. Doing so will void the warranty on this antenna.
For best performance, the antenna should be tuned for proper SWR. You can tune this antenna as follows: Insert the top whip element halfway into the coil and tighten the screw at the top of the coil. Measure SWR at Channel 1 and Channel 40. Ideally, the SWR should be the same at both. If Channel 1 has a higher SWR, loosen the screw and lengthen the whip. If Channel 40 has a higher SWR, loosen the screw and shorten the whip. When the SWR at both is as close as you can get it, tighten the screw fully.
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