JPole antennas for 2m40m with Wiremancable
The picture shows the scheme of a JPole antenna. The high impedance feeding point of a l/2wire (L1) is matched from some KOhms to a low impedance with a l/4 matching sector (L2). The point XX has an impedance of 50Ohm for direct feed with a coax cable. XX is symmetrical, a choke or balun could be useful to avoid sleeve waves on the screen of the coax. A very simple method for the l/4part is to use a 450OhmWireman cable. I have built up the antenna for 2m, 6m, 12m and 30m. The table gives the values for experimenting with the other bands. L1=0,471l (HalfwaveRadiator) L2=0,223l (Wiremancable) Solder the braid of the 50Ohmcoax at the left X, the inner conductor to the right X. XX about 510% of L2. 
The antenna can be mounted in several ways:
The classic JPole with both sections mounted vertically. Length 3/4l, only for the higher bands.

It is no difference in the radiating conditions, if the l/4part is vertical or horizontal. The pattern is identical with a vertical dipole. 
Both parts horizontally mounted 
The "Zepp"configuration 
The antennas were tested on 2m, 6m, 12m and 30m. The lengths for the bands marked with "*" have not been tested, try with he given dimensions. For other frequencies use the following fomulas for insulated 2mmwires for L2. Notinsulated wires need a longer L2section.
L1=0,471l (HalfwaveRadiator) L2=0,223l (Wiremancable)
The points XX are 510% from the shorted part of the Wiremancable (look for best SWR).
For the 50MHzJPole look on the special page: 50MHzHalfwaveVerticals
Band 
l/2
Wire 
l/4
Wireman 
XX 
F_{o}
MHz 
SWR

Bandwidth 
40m* 
20,02m 
9,46m 
73,0cm 
7,05 
 
100KHz 
30m 
13,96m 
6,61m 
58,5cm 
10,12 
1,1 
150KHz 
20m* 
9,98m 
4,73m 
35,0cm 
14,15 
 
200KHz 
17m* 
7,80m 
3,70m 
26,5cm 
18,1 
 
250KHz 
15m* 
6,66m 
3,15m 
22,5cm 
21,2 
 
300KHz 
12m 
5,67m 
2,67m 
18,5cm 
24,91 
1,0 
350KHz 
10m* 
4,96m 
2,45m 
15,5cm 
28,5 
 
500KHz 
6m 
2,815m 
1,33m 
6,5cm 
50,15 
1,1 
1000KHz 
2m 
0,975m 
0,47cm 
3,5cm 
145,2 
1,0 
1500KHz 
The result of 10 Minutes work with the 12mJPole, mounted on a fishing rod:
The 50MHzJPole see: 