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The JK Big-Tri has been designed for Hams looking for a slightly longer boom Tribander while enjoying maximum performance on 20/15/10.


This Tri-Bander's elements follow the same taper schedules and element construction as the Navassa5 antenna.


This antenna is very specifically priced and marketed to the segment of the Ham community that wants to put up a Yagi with  an outstanding signal and the best quality mechanical build in the marketplace.


This antenna has excellent Gain, F/R and SWR characteristics and is manufactured the same way as our larger Yagis with the same high quality materials and hardware.



JK Big-Tri    4 Elements on 20M / 5 Elements on 15M / 7 Elements on 10M / 36 Foot Boom

Peak Gain is shown over a dipole in Freespace
Dipole in Freespace = 2.14dBi

JK Big-Tri


Approx wt. = 140 lbs

Wind Area "C" = 14.8 Sq. Ft

                  "G" = 26.64 Sq. Ft

Projected Area  = 22.2  Sq. Ft

Max Wind Speed = 100 Mph

Max Turning Radius = 25.4 Ft

Feedpoint = Direct 50-Ohm







Number Elements




Active Boom Length

31 ft

31.7 ft

30 ft

Peak Gain*

9+ dBd/ 11+ dbi

8.2+ dBd/ 10.3+ dbi

7+ dBd / 9+dbi

Peak F/B

20+ dB

20+ dB

15+ dB

Peak F/R

20+ dB

20+ dB

15+ dB

2:1 SWR Bandwidth

850 KHz

Less than 1.5:1 across the band

Less than 1.5:1 across the band

1.5:1 SWR Bandwidth

750 KHz

450 KHz

350 KHz

Max Element Length

18 ft

24.25 ft

36.5 ft

** All pricing shown assumes the basic mounting hardware. Additional costs may apply for customized mast plates and hardware.

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© 2015 JK Antennas & Systems