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JK3040Sr    4 Elements on 40M /3 Elements on 30M / 36 Foot Boom


The JK3040Sr is the combination of the JK404C & the JK303 on the same boom with 2 independent feed-points.


This antenna is made for the DX'er that ís looking for an antenna to work across the globe on 30M & 40M.


The Key feature of this antenna is that it can be mounted above or below Tribanders or other monobanders without any interaction.


It is made with very high quality materials and the best in its class in the market in terms of mechanical construction and electrical performance.


Price : US$5,995.00 **

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

Approx wt. = 215 lbs

Wind Area "C" = 16.1 Sq Ft

                "G" = 28.9 Sq Ft

Projected Area = 24.15 Sq Ft

Max Wind Speed = 100 Mph

Max Turning Radius = 31.25 Ft

Boom = 2.5" OD

Feedpoint 40M = 50-ohm Direct

                30M = Shunt Matched

Power = 5KW Avg or Balun restricted



Number Elements


Active Boom Length

35.5 ft

Peak Gain*

5.2dBd / 7.3dbi

Peak F/B

23 dB

Peak F/R

22 dB

2:1 SWR Bandwidth

265 KHz

1.5:1 SWR Bandwidth

210 KHz

Max Element Length

49.5 ft



Number Elements


Active Boom Length

30 ft

Peak Gain*

5.6 dBd / 7.8dbi

Peak F/B

20+ dB

Peak F/R

18 dB

2:1 SWR Bandwidth


1.5:1 SWR Bandwidth

50 KHz

Max Element Length

32.4 ft

40M Plot at 100Ft above average ground SSB

40M Plot at 100Ft above average ground CW

40M Plot - Freespace SSB

40M Plot - Freespace CW

30M Plot - Freespace

30M Plot at 100Ft above average ground

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

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