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Antenna Theory jpole
Another approach to the problem is the J-Pole" antenna, in this design, the antenna is elevated at least 1/4 wavelength above ground, thus eliminating the ground losses and "normalizing" the radiation pattern. The Impedance matching between the low impedance feed line and the high impedance of the end of the dipole
post 29 May 2026
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2 meter J-Pole
Cut the tubing to the size shown for the desired band. The only section where size is not critical is the mast section. Use any size you desire for mounting purposes
2 meter Aluminum Slim Jim Antenna
The Slim Jim is generally characterized as an end-fed vertical folded dipole. As with all end fed dipoles some sort of impedance matching is necessary to keep the SWR down
3 meter Slim-Jim Antenna
The gamma match consists of a 150mm length of 10mm aluminium tubing
Project antenna for 2 meter
The gamma match consists of a 150mm length of 10mm aluminium tubing
A slim antenna for vhf band
To build it I use pieces of 450 Ohms leader line approx. 154cm, a PVC tube approx. 200cm, rope,SO-239 female connector, RG-58 about 1,5meter
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Cut the tubing to the size shown for the desired band. The only section where size is not critical is the mast section. Use any size you desire for mounting purposes
The Slim Jim is generally characterized as an end-fed vertical folded dipole. As with all end fed dipoles some sort of impedance matching is necessary to keep the SWR down
The gamma match consists of a 150mm length of 10mm aluminium tubing
The gamma match consists of a 150mm length of 10mm aluminium tubing
To build it I use pieces of 450 Ohms leader line approx. 154cm, a PVC tube approx. 200cm, rope,SO-239 female connector, RG-58 about 1,5meter
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