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300 ohm transmission aluminum amplifiers anchor Antenna Construction antenna installation antenna system Array with Reflectors attenuation bakelite band folded dipole bandwidth bolts building channel characteristic impedance chimney coaxial cable conductor connected Corp designed dipole and reflector dipole antenna dipole with reflector dipole-reflector direct signal drill driven element element spacing feet frequency response front-to-back ghost image ghost signal guy wires high band folded hole impedance matching inch insulators interference length lightning arrestor located low band folded matching transformer megacycles mismatch mission line mounting base mounting bracket N. Y. Model Type necessary ohm transmission line parasitic element picture pipe placed quarter wavelength ratio receiving antenna reception reflected signal Remote Pickup Unit response pattern Screw Anchor serviceman shown in Figure Simple dipole Stack folded dipoles standing wave ratio standing waves stations steel supporting arm T-matched dipole television bands television receiver tenna terminals transmitter tubing viewing screen voltage wall wood