5 Element VHF (126-150MHz) Beam
Maritime, Military, Ham, Air

$399.00  $275.00
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High Demand requires 2 week lead-time.

The Alpha Antenna VHF Beam is a commercial quality, heavy duty, and directional base antenna that radiates and receives greater power in specific directions. This allows performance to be increased, while also reducing interference from unwanted sources that are on the "back side of the beam". Performance is further maximized with the N-Connector that is mounted on the boom.

The antenna is constructed using two 1 inch square aluminum 3 foot booms with 1/8 inch walls. The elements are constructed of .625" aluminum. The included mounting kit, which makes the total length of the antenna just over 4 feet, is an H-Beam type Stand-Off that can be installed on top of a mast or side mounted on a tower up to 1.5 inches in diameter.

Analysis

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2 Meter Beam SWR < 2:1


Maritime, Military, Ham (Amateur), Air Band Coverage
(Scroll to bottom of page)

Maritime
All maritime-only bands in the VHF high band covered by this antenna, specifically 153-154MHz.

Military
The primary military-only bands in the VHF high band are 138.00-144.00MHz and 148.00-150.775MHz, all of which are all covered by this antenna.

Ham (Amateur)
The ham-only bands in the VHF high band are fully covered by this antenna from 144-148MHz.

Air Band
All of the air-only bands in the VHF high band are covered by this antenna, specifically 128.8250-136.9750MHz.

Details

Beam Antenna Type: Log Periodic (LPDA)

Beam Antenna Elements: 5

Antenna Power Rating: 500 W

Beam Antenna Boom Length: 3 ft. (with Mounting Hardware 3.75 ft.)

Beam Antenna Longest Element: 71.000 in.

Mast Mounting Clamp Minimum: 1.250 in.

Mast Mounting Clamp Maximum: 1.500 in.

Beam Antenna Frequency Coverage <2:1 SWR: 126-150 MHz

Feedpoint Impedance: 50 ohm

Antenna Feedline Connection Type: Type N, female

Antenna Weight: 7.44 lbs.

Beam Antenna Elements (app): 5

Beam Antenna Gain: 8.5 dBi

Beam Antenna F/B (dB): 15.0 dB

E-Plane 3 dB Beamwidth: 60 degrees

H-Plane 3 dB Beamwidth: 110 degrees

Bandwidth at <2:1 SWR: Over 24.0 MHz

Maritime Coverage (MHz)

153-154 Maritime VHF

Military Coverage (MHz)

Air Force
138.000-138.500
138.875-138.925
139.600-140.000
140.375-140.425
141.525-151.925
142.125-142.300
143.425-143.475
143.750-143.925
148.050-148.250
148.450-148.550
149.150-149.325
149.475-149.550
149.925-150.050
150.150-150.350
 
Navy
138.525-138.850
138.950-138.875
139.475-139.575
140.025-140.350
140.450-141.000
141.950-142.100
142.500-142.850
143.500-143.725
148.275-148.425
148.950-149.125
149.350-149.450
150.075-150.125
150.375-150.400
 
Army
139.000-139.450
141.025-141.500
142.325-142.475
142.875-143.400
143.950-143.975
148.000-148.025
148.575-148.925
149.575-149.900
150.425-150.775

Ham (Amateur) Coverage (MHz)

144-148 - 2 Meters

Commercial Aircraft Coverage (MHz)

128.8250-132.0000 Operational Control
132.0250-136.4750 Air Traffic Control
136.5000-136.8750 Domestic VHF
136.9000-136.9750 International and Domestic VHF

ARINC En Route Service
128.9000 Southwest USA
129.4000 Northeast USA / Canada West Coast and Anchorage
129.4500 East Central USA
131.8000 Northwest USA
129.9000 Maritime Net (Northeast Coast USA)
130.7000 Mexico / Carribean
131.1750 Southeast USA
130.4000 West Central USA
131.9500 Pacific Net (West Coast USA and Hawaii)

Aircraft Communications Addressing and Reporting System (ACARS) - BM, CSQ, AM, Data
129.12500  ACARS 129.125 ACARS 
130.02500  ACARS 130.025 ACARS 
131.12500  ACARS 131.125 ACARS (High Traffic Areas) 
131.55000  ACARS ARINC Base ARINC-Americas Base Frequency 
130.45000  ACARS 130.450 ACARS (High Traffic Areas) 
136.80000  ACARS 136.8 ACARS 
136.75000  ACARS 136.75 ACARS 
136.97500  VDL Mode 2 VHF Data Link (VDL) Mode 2 
129.52500  ACARS 129.525 ACARS 
131.72500  ACARS SITA Base SITA Base Frequency 
129.35000  ACARS 129.35 ACARS 

Notes: Commercial quality, heavy duty beam antenna suitable for reception or directional transmission, where coax attaches to a female N-Connector on the dual boom design. This dual boom design provides incredible strength for extreme conditions. Electrically, the dual boom design operates similarly to a ladder line, and provides a low impedance system for feeding the antenna elements. Unlike traditional multiband beams that only use a limited number of elements for any given frequency, this antenna maximizes efficiencies by enabling every element to be active. This results in higher gain than other antenna designs of the same dimensions for any one section of this system.

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