Technical information

Antennas & Mounting Hardware
20 ALFA through to 20/6269 are 20 element narrow
bandwidth antennas, with a genuine ±12° horizontal
and ±23° vertical half power angles.
They drag in signal from afar like nothing else!
Tech Tip:
Stacking two identical antennas doubles the signal power,
providing an extra 3dB. Four antennas, an extra 6dB. Fracarro
stacking couplers can be used to stack many different antennas.
Stacking also halves beamwidth and sidelobes whilst improving
front to back ratio. Space of about 1.5 wavelengths between
each 20 element antenna is required.
20 ALFA
20 DELTA
20/4046
20/4753
20/5461
20/6269
20 ELEMENT NARROW BAND UHF YAGIS
20 ALFA 14dB gain for UHF CB, nice 50Ω match.
20 DELTA Au ch. 24–36, 14dB gain, 26dB f/b ratio. block B
20/4046 Au ch. 34–49, 14dB gain, 26dB f/b ratio. block C, block D
20/4753 Au ch. 40–57, 14dB gain, 26dB f/b ratio.
20/5461 Au ch. 45–67, 14dB gain, 26dB f/b ratio.
20/6269 Au ch. 55–69, 14dB gain, 26dB f/b ratio.
20/4753
CA1 Boom support
close up.
Tech Tip:
CA1 boom support, improves physical
strength of FR 20 element antennas.
CA1 boom support, recommended for
20 element BL series and narrow band
Yagi antennas.
Included in all 20RD models at no extra cost.
Catalogue 106
17