136-174 MHz Dipole antennas DA2 VHFA, DA2 VHFS : Radial :

Electrical specifications

Model	DA2 VHFA	DA2 VHFS
Operating frequency band, MHz	136-174	136-174
Frequency bandwidth, MHz	38	38
VSWR, not more than	1,5	1.5
Gain, dBi	6,7	6.15
Sector in E-plane , -3dB	38°	38°
Sector in H-plane , -3dB	240°	240°
Impedance, Ohm	50	50
Max. power input, W	400	400
Polarization	vertical

Mechanical specifications

Model	DA2 VHFA	DA2 VHFS
Weight, kg	17	25.62
Size, mm	2440x610x40	2440x610x40
Construction material	Aluminium alloy (A)	Stainless steel (S)
Temperature range, °C	from -50 to +50
Connector	N-female	N-female

Especially for areas with a harsh climate in the Far North, two-dipole antennas were developed. The antennas are made of all-welded construction with an internal addition system and offered in two models: aluminum (A) and stainless steel (S) for harsh Arctic conditions.
Thanks to modern computer modeling and measuring instruments, these antennas have a very wide band as agreed (see diagram), which has a positive effect on the quality of communication during icing. Each copy of the antenna before shipment passes the output control at factory.

VSWR diagram DA2 VHFA

VSWR diagram DA2 VHFS

H-plane pattern DA2 VHFA

E-plane pattern DA2 VHFA