Channel Master Established in 1949, Channel Master was originally a terrestrial antenna manufacturer and now is in the business of manufacturing set-top boxes, home networking accessories and digital media devices .

Notable products

"Internet-to-tv™" home networking devices allow users to connect their entertainment devices to the internet using existing coaxial cable outlets and power outlets.

The 4251 was a parabolic

Parabolic antenna

A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish...

 UHF television antenna

Television antenna

A television antenna, or TV aerial, is an antenna specifically designed for the reception of over the air broadcast television signals, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries...

that was noted for its high performance. It was about seven feet in diameter.