450 ohm ladder line jpole antenna kd3y

In June I was looking for a convenient antenna that I could throw in my GoBox.  The solution I came up with was a easy-to-stow, roll-up J-Pole I made from 450 Ohm ladder line.  It rolls up conveniently and can be stored in my GoBox or under the truck seat.  It deploys easily by throwing a small rope over a tree limb and hoisting it up as high as possible.   This was the first one I made and I got the SWR down to 1.2 to 1.3 on 2-meters and 1.4 to 1.5 on 70 cm, but the next two I made were really hard to tune.  I could only get them down to about 2 to 2.5 SWR on 2-meters.  Due to the very narrow bandwidth of this style of antenna, the length and cut out section placement has to be very very close else it won't tune to a low SWR.  

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