"Cloverleaf" Antenna for F.M. Broadcasting

The radiation requirements and general design considerations for transmitting antennas suitable for f.m. broadcasting are briefly discussed, and an explanation of the design and operation of the arrangement of radiating elements and associated feed system employed in the "cloverleaf" antenna is given. Both calculated and measured data are included, showing field-intensity distribution, gain, impedance-frequency characteristics, etc. Design features which are discussed include a simple coaxial impedance-matching transformer developed initially for microwave application, and the method and facilities provided for the removal of sleet.