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As evidenced by this
advertisement in a circa 1951 issue of Radio & Television News magazine,
Channel Master has been producing commercial broadcast television and radio antennas
and antenna accessories for a really long time. They are one of the very few companies
still making such items, with RCA being another. A few years ago I bought a high gain
Channel Master VHF-UHF-FM
antenna for use with my vintage
Alliance Model U-100 Tenna-Rotor. Both companies still sell remote control (wired)
antenna rotators. Being an ardent over-the-air broadcast adherent, having a good
old-fashioned steerable, multielement antenna is quite nice. I can dial in any TV
or FM radio station within 50 miles, and some from over 100 miles away. I would
like to have a similar setup for AM radio, but the antenna length gets out of hand
at 530 to 1,700 MHz (525 to 1,705 MHz including 10 kHz channel spacing),
equating to quarter wavelengths from 455 to 145 feet, respectively.
Channel Master Corp. Ad
 Tests Reveal Serious Mismatch in Stacked
Yagis!
New Z-Match Yagi Achieves 100% Perfect Match To 300 Ohm Line, Single or Stacked.
Higher Gain On All Yagi Installations Accomplished By Adjustable Impedance And
Wider Spaced Elements.
Now! Stack Yagis without extra stacking bars!
Mismatch eliminated! Now Channel Master proudly introduces the Z-Match Yagi -
a new antenna that guarantees 100% perfect match in both single and stacked Yagi
installations.
Single bay Yagi perfectly matches 300 ohms because of wider spaced elements.
When Yagis are stacked, the center bars of the folded dipoles are removed and used
as half-wave connecting rods. This reduces the impedance of each antenna, and automatically
creates a perfect 300 ohm match for the complete stacked Yagi array. The Z-Match
system, plus wide spacing, provide higher gain for Channel Master Yagis, single
or stacked. No extra stacking bars result in lower cost.
Channel Master Corp.
Napanoch Road, Ellenville, N. Y.
Write for complete technical literature.
Posted September 14, 2020
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