HB9CV Antenna For FM Broadcast Band

[Genie FM]

I've been looking at this design and it seems like a compact beam antenna with a good front to back ratio, that could be useful on 3 meters. Does anyone know someone who could make these at a reasonable price? Cheers,Mmike

[Electronically]

I've been looking at this design and it seems like a compact beam antenna with a good front to back ratio, that could be useful on 3 meters. Does anyone know someone who could make these at a reasonable price? Cheers,Mmike

No it most certainly is not.
However a yagi is most likely better as each pole has a difference for instance each pole could have 1/4 next pole along could have 1/2 next pole could have 5/8 and so on. I've never been a fan of yagis but they do work from what I hear. But not a thing I fancy building. I prefer endfed I know the ohms are massive well depending on length and diameter of conductor should be OK. Anyways cutting along story short. If you like antennas stick to a jpole as that is basically 2 1/2 halfwaves cramped together. The (1/4 wave stub short) can act as a ground. But do me a favour don't use copper can cause you problems later.

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[Albert H]

The HB9CV is OK for what it was intended to do. It's NOT a broadcast aerial. If you want to send your signal in a particular direction, a vertical Yagi is your best bet. There are lots of 144MHz and 70MHz designs on the 'net - just scale one to your frequency of choice! You can buy the materials in your local hardware emporium, and if you're really lazy, you can but a 75Ω-matched 3-element Yagi made by "Antiference" in most DIY warehouses. If your rig is matched to 50Ω (most are), you'll get a substantial mismatch, but a 50 to 75Ω sleeve transformer is trivially easy to build, and you can use cheap TV coax to feed the antenna if your power is 50 Watts or less.