well just for funsies i had a look at the patent sheet for the wilson base loaded antennas
and thought i would post a link and some info that might be useful to anyone looking to build their own base loaded CB antenna.
not really what i was looking for, but cool nonetheless.
https://patents.google.com/patent/US4882591
and here are a few paragraphs with the specs of the coil itself:
Applicant has constructed and tested an antenna of the type illustrated in FIGS. 1-9. The coil 12 is formed of about 34 inches of No. 10 copper wire (about 0.10 inch diameter) having a coil diameter of about 1.86 inches (as measured across the centers of the wire), and has about 5 7/8ths turns. The spacing between turns (about 0.05 inch) is about half the wire thickness, and the ratio of length (height) to diameter of the coil is approximately 0.55. Each turn of the coil (and the space between adjacent turns) has a circumferential length of 5.84 inches, and only about one-third inch of that length of space between adjacent 360° turns is occupied by the dielectric material of the coil support. As described above, most of the space between turns of the coil is occupied by air rather than solid material, and most of the volume within the coil is occupied by air rather than solid material.
The Q factor, which denotes the overall efficiency of the antenna is given by the equation Q=X/r, where X=reactance and r = series resistance. Distributed capacitance lowers the reactance X; minimizing inter-turn capacitance results in an increased X and therefore an increased Q. The resistance r was lowered by coating the wire with heavy silver plating, which is especially useful because most current at high frequencies travel in the surface region of a conductor. Similarly, the conductors 82, 86, and 90 (FIG. 6) which connect to the coil were heavily silver plated. Solder connections were made by silver solder.
FIGS. 10 and 11 illustrate another antenna 150 somewhat similar to that of FIGS. 1-9, but wherein a coil support 152 is formed in the cover 154 of the frame. The coil support includes a plurality of fins 156-159 radiating inwardly from a tubular part 153 of the cover 154, and having grooves 160 that closely surround the coil windings. This arrangement also results in most of the space between adjacent turns of the coil being unoccupied by solid (or liquid) material. Also, as in the case of the embodiment shown in FIG. 8, more than 75% of the area within the coil is unoccupied by solid material.
just thought someone here might find that useful someday.
LC
