Plastic

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Fig. 2. The sewerpipe antenna.

VLF Substation, Longwire, Antarctica, home of the 21-mile dipole, There they use 146.76 MHz VHF/FM for both on-site and station-to-station communications.

Semigrid coax is used, and the 60 section is made By removing alternate half-inch sections of the dielectric inside the coax for about 16 inches. This raises the characteristic impedance from 50 to about 60f2. The original version is more suitable for mobile use, however, because of its greater rigidity and mechanical strength. . Patterns taken at the University's antenna range show an almost perfect free-space dipole pattern. The measured gain over an isotropic antenna was 1.62 dB as compared

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