I've recently become interested in antennas and how and why they work. I ran across a old, what looks like a marine antenna, in a 15' fiberglass pole. I took it apart and found a very confusing configuration. The feed is 50 ohm. The feed point is a RG-58 A/U coaxial connected to, or looks like, a small J-Pole made from #10 wire abt 20" long. The coaxial is connected the same as a J-Pole and was obvious that connection was used for tuning. Connecting to the drive element of this J-Pole is a series of four 3/16 brass elements separated by three air coils/chokes 3/4"D x 6"L made from #10 wire, with coil spacing of 1/4", coils are spaced, or placed, between the elements, except the junction of the J-Pole to the first element, approximately at 1/3rd intervals, making the a total e.element length of 14', in series. Don't know the mfg. Looks like it might be a Shakespeare. It has a 14" long aluminum casing at the bottom of the antenna that is obviously acting as a capacitor of some sort to the antenna inside. I'm thinking this antenna is a VHF or UHF antenna so I stood it up on a wooden platform about 30" off the ground in a clear area and used my MFJ 259b to see. Sadly, I didn't get a dip at any frequency, could be the coaxial is shorted My question is; How are the air coils being used? Are they traps? Are they loading coils to lengthen the antenna. Are they using the coils to get multi band operation? I'm needing some guidance. Any help will be appreciated.