These two element, directional yagis are very robust and manufactured to a high degree of Telecommunication specification. They give a gain of 3 dB over a 1/2 wave dipole and can withstand a maximum input power rating of 200 watts.
The dipole element is made from one piece of tube, thus removing potential high resistance points and the balun is completely seal-moulded in black carbon loaded polyethylene to protect the internal electrical connections.
These antennas can be stacked and fed in phase with a matching harness for increased gain.

Gain over 1/2 wave dipole 3dB
V.S.W.R. Better than 1.5:1 over the operating band
Input impedence 50 ohms
Maximum input power rating 200 watts
Bandwidth  +/- 8% of centre frequency
Polarisation  Vertical or Horizontal
Half power beamwidth E Plane 65 degrees, H Plane 95 degrees
Front to back ratio 13 dB
Connection  3 metre length of RG 213 fitted with an N-Type socket and a  protective pvc sleeve. 
Support boom  1 1/4" x 12 SWG aluminium tube HE30TF.
Radiating elements  3/4" x 16 SWG aluminium tube HE9TF.
Castings Aluminium alloy Kemloc
Nuts & bolts 18/8 stainless with Nyloc nuts
Insulator  Black carbon loaded polyethylene
Weight              @  70MHz            3.5 Kgs
                         @  165MHz          2.0 Kgs
                         @  190MHz          1.7 Kgs

Windloading  @  70MHz   18Kgf (39.7lbf) @ wind velocity of 160 Kph       
                      @  165MHz 10Kgf (22lbf) @ wind velocity of 160 Kph           
                      @  190MHz   9Kgf (19.8lbf) @ wind velocity of 160

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Radio Structures Ltd - Antenna

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Tel: 01604 790005 - e-mail: sales@radiostructures.com