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MONO3 20


MONO4 15

Momobeam MONO4 15m yagi antenna
Momobeam MONO4 20m yagi antenna

MONO4 20


MONO4 20


MONO4 20 is a full size 4 element yagi with excellent SWR bandwidth, optimum gain and front-to-back performance. This antenna is light weight for easy handling yet strong enough for harsh weather conditions. It is perfect in multi-stacked arrays. A MONO4 20 stack is typically configured for either maximum forward gain or positioned to cover a greater area of the world.

Mounting: Mast or side mounted on towers.
Requires a rotor for medium load

RF choke: 3kW included

Availability: 4 weeks

Contact us for more info

2 U-bolt 50/60 mm (2-2.3 in) INCLUDED.
If you need larger ones, please choose below.

If you prefer, choose below a different RF choke.


MONO4 20Band 20 m
Gain dBi: (20 meters above the ground)13.6
Gain dBd free space:6.3
Active elements:4
Bandwidth KHz S.W.R. ≤ 1.5:1350
Boom Length:860 cm/28.2 ft
Turning radius:650 cm/21.33 ft
Feed lines required:1 X 50 Ohm
Max tower lift side:100 cm/3.2 ft

Longest element:
1100 cm/36.9 ft

Power handling:
10 kW

Wind area:
0.95 m²/10.22 sq ft

Wind load 130Km/h:
767 N

Wind survival*:
160 Kmh – 100 Mph

Tower Leg/Mast diameter: 50/60 mm – 2/2.36 inch (larger on request)

RF choke**:
3 KW included

Weight (excluding packaging):
40 Kg/88 lb

Materials used

Tubes and plates:
Aluminum alloy 6060T6

stainless steel

insulating clamps:
polypropylene UV resistant


*Wind survival is the maximum wind speed to which the antenna can be subjected without incurring permanent deformation (calculated in the absence of ice)

**The Momobeam RF Choke (standard product offering, rated at 3 KW) is made from high quality Teflon dielectric, double shielded, low loss coaxial cable with properly selected ferrite material that is sleeved over the cable that together, create a high impedance path for RF, providing high isolation between the antenna and coaxial feedline.

An SO-239 female connector is included for convenient attachment to the customer feedline and its PL-259 Male connector.

The 5 KW and 10 KW rated RF chokes (optional purchase) are made from the same materials except the coaxial cable is 10 mm diameter.

The 10KW version uses a 7/16 DIN style connector.

Get the manual

MONO4 20User Manual EN 940 KB 2 downloads

User Manual MONO4 20 ...
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