I’ve been searching for information regarding the radiation angle and the gain of slim jim antenna, but found none of it. So I decided to build the model of the antenna inside the ever useful MMANA-GAL software to get the information I needed myself.

From what I can surmise, the slim jim has a slightly lower radiation angle than vertical dipole antenna and is easier to mount, thus it is suitable to use for point-to-point communication VHF-UHF operation. It has a gain of about 2.8dBi-3.2dBi in free space and 4.8-5.8dBi when mounted at about 30feet from the ground. Here’s the result of MMANA-GAL :

Slim Jim 9w2wtf

Slim Jim mounted 30 feet above ground
Slim Jim Antenna gain

Slim Jim in free space

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Reader's Comments

  1. discount24hrs | January 3rd, 2010 at 12:12 am

    very low angle and very low gain too??

  2. attapon77 | January 18th, 2010 at 4:29 pm

    Are you have twinlead version ?????

  3. Arawan | March 29th, 2010 at 2:46 pm

    What about gain of slim jim versus J-pole?
    Any difference?

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