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OB4-40 4 Element 40m duo driven Monoband-Yagi

 OPTIBEAM OB4-40 4 Element 40m duo driven Monoband-Yagi
The best 4 element 40m duodriven monoband-Yagi of the world:
 
  • The OptiBeam high Q air coil reduces the length of the elements nearly lossfree down to clearly below convenient 15 meters.
  • complete coverage of the 300 kHz with best SWR, constant gain and stable radiation pattern.
  • Due to the especially developed „40m decoupling stubs“ interaction is avoided to other Yagis in the frequency range of 14 to 30 MHz.
     
OB4-40   4 Element Yagi 40m    
         
Bands   40    
Gain (dBd) *   5    
Gain (dBi) **   11.9    
F/B (dB)   25    
VSWR        
7,00 - 7,06 - 7,10 - 7,15 - 7,20 - 7,30   1,5 - 1,1 - 1,2 - 1,2 - 1,1 - 1,3    
         
Elements (number)   4    
Max. Elementlenght (m)   14.74    
Boomlenght (m)   11.9    
Turning Radius (m)   9.45    
Feedlines (number)   1 Coax 50 Ohm    
Weight (kg)   80    
Windload at 130 km/h   1.200 N / 1,49 mē / 16,2 feetē    
         
Price ***   3.233,00 EUR    
 
 
* = average gain over dipol in free-space / for comparison: 2 el monobander 4 dbd, 3 el 5-6 dbd
** = average gain at 20m above ground (= dbd + 2.15 db isotropic + about 5 db ground reflection)
*** = outside EU minus 19% tax - subject to change
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