Abstract: A high input selectivity UHF varactor tuner for a television receiver in which unamplified radio frequency signals are inductively coupled to a double tuned half-wave preselector comprising two aperture coupled half-wave tuned lines in separate resonant cavities. The double tuned preselector includes varactor diodes on one end of each tuned line and fixed capacitors on the other end of each line. To compensate for decreasing Q of the varactor diodes with decreasing frequency and thereby maintain a uniform bandwidth for the tuner over the entire UHF spectrum, inductive coupling is provided between the tuned lines at the fixed capacitor ends which, during low frequency operation of the tuner, augments aperture coupling between the lines.