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JK403    3 Elements on 40M / 30 Foot Boom

Price : US$3,095.00 **


The JK403 is a great performer antenna on a 30ft boom for 40m. This antenna has excellent F/R and gain while maintaining a decent SWR bandwidth. The antenna is made with our high quality, heavy duty materials and hardware. The element construction does not need trussing unless you live in extreme snow/ice conditions.


We can also provide you with custom settings to suit your operating preference such as peaking your gain and F/B in the CW portion or the Phone portion of the band.

Approx wt. = 125 lbs

Wind Area "C" = 8.40 Sq Ft

                "G" = 15.12 Sq Ft

Projected Area = 12.6 Sq Ft

Max Wind Speed = 100 Mph

Max Turning Radius = 28.6 Ft

Boom = 2" OD / 0.125" wall

Feedpoint = Shunt coil match/50-Ohm

Power = 5KW Avg or Balun restricted



Number Elements


Active Boom Length

29.5 ft

Peak Gain*

5.06 dBd

Peak F/B

23 dB

Peak F/R

22 dB

2:1 SWR Bandwidth

175 KHz

1.5:1 SWR Bandwidth

125 KHz

Max Element Length

47.5 ft

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

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

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