Harman Kardon
In 1959, Harman Kardon marketed the Citation II, an early ultra wideband stereophonic tube amplifier. Designed by Stewart Hegeman, it featured 60 watts/channel output with a frequency response of 18-60,000 Hz at 20 watt output. The company promoted their philosophy of designing high fidelity sound using amplifiers that provided widest possible audio bandwidth. Although the human ear highest audible range is around 20,000 Hz, the full range of sound goes beyond that with harmonics and overtones that may be beyond the hearing range of the human ear. These harmonics interact with other frequencies to produce audible secondary sounds or interference. Harman Kardon promoted the design in audio magazines and product brochures.
WCAT Radio Tower
The WCAT Radio Tower, at , is the tallest man-made structure in Vermont. It is located in Burlington, Vermont. It broadcasts at 5000 Watts. WCAT is the only radio station that has a radio tower within the city limits of Burlington. There is a second tower, also built in 1981, which is a directional aerial beside the WKDR Radio Tower. There is also a third tower on the site, which is tall.