Hy-Gain VB-25FM Instruction Manual

308 Industrial Park Road
Starkville, MS 39759 USA
Ph: (662 ) 323-9 538 FAX: (662 ) 323-
INSTRUCTION MANUAL

General Description

This antenna is a 5-element, 2-meter beam op-
timum spaced on a 75" boom. It features high
forward gain and an excellent front-to-back ratio.
The antenna is end mounted giving it the ad-
vantage of no mast decoupling and a broad
frequency response. This antenna now uses stain-
less steel hardware in most locations except for the
U-bolts. Also, this antenna now features a NEW
boom-to-mast bracket that fits up to a mast
diameter of 2 1/16 inches.
Boom Length
Longest Element
Net Weight
Turning Radius (Max)
Wind Survival
Mast Diameter
Boom Diameter
Wind Area
Gain (Average)
Front-to-Back Ratio
Maximum SWR
Band Width
Maximum Power
Impedance
Half-Power Beam Width
Stacking Distance
Model VB-25FM
2-Meter 5 Elements Beam

SWR and Feedline

The 25FM antenna has an input impedance of 200
ohms. The supplied balun matches the input to 50
ohms. If you are using transmission line with a
characteristic impedance other than 50 ohms or
200 ohms, a matching device must be made. Refer
to any current Amateur Handbook for information
on constructing a matching device.

Specifications

Mechanical
Electrical
75" (1905 mm)
39 5/8" (1006 mm)
2.9 lbs (1.3 kg)
73" (1854 mm)
80 mph (129 kmph)
1 5/8" to 2 1/16" O.D. (41mm to 52mm)
1 ¼" O.D. (32mm)
0.585 sq. ft (.054 m^2) (horizontal)
0.740 sq. ft (.0688 m^2) (vertical)
11.3 dBi (9 dBd)
250 Watts continuous, 500 Watts P.E.P
50 ohms (with balun)
60 degrees (vertical polarization)
45 degrees (horizontal polarization)
82" (2083 mm) minimum
20 dB
2:1
4 MHz