This is my build of a tape measure yagi antenna centered around 146Mhz. I used a harbor freight tape measure as the sacrifice for the antenna elements. It is all based on this really well done drawing by NT1K.
Fox hunting, also known as radio direction finding was my intention with this antenna.
I made heavy use of duct tape both to hold the elements and to cover the ends to prevent injury. I did use steel hose clamps for the driven element because this made it easier to adjust. The hose clamps are not as cheap as duct tape so duct tape it is. I also didn't get another cross connector for the end since the T was slightly cheaper. It works pretty well and I was able to find several VHF noise sources in my house with it.
I just used RG-174 with an SMA connector on the end for use with a handheld transceiver.
On the back side you can see the hair pin matching wire soldered to the tape measure driven element.
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| Top -AC9LF |
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| Bottom with matching hairpin -AC9LF |
Drawings with associated location of posting:
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http://nt1k.com/blog/2012/vhf-3el-tape-measure-yagi/
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http://nt1k.com/blog/2012/vhf-3el-tape-measure-yagi/
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http://nt1k.com/blog/2012/vhf-3el-tape-measure-yagi/
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It's currently folded up waiting for a fox hunt adventure. I will also create a step attenuator for it at some point.
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