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Author Topic: Can you use a High Gain Dual band 2m-70cm antenna for FM DX?  (Read 9462 times)

Offline Dxer92

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Hey guys here I go again for yet.... another question regarding antenna's. Anyways, I was wondering if a High Gain Dual Band Ham radio antenna for 2m-70cm's will work well for receiving on 88- 108 Mhz? I WILL NOT BE TRANSMITTING NOR BROADCASTING on this band, just want to see how wellit will receive on these frequencies. The antenna I am going to be using however for my Ham radio setup is a Diamond X700.

Offline ThaDood

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Re: Can you use a High Gain Dual band 2m-70cm antenna for FM DX? Um, no.
« Reply #1 on: December 15, 2016, 1817 UTC »
I have tried that as an experiment with both a Comet GP-15 tri-band antenna (6M / 2M / 440MHz.), years ago and then later with a discone antenna. On FM radio? It sucked. And, what local stations it did RX was plagued with multipath fuzz noise. The discone wasn't much better. maybe in a crowded, metro area it would be OK to do that, but for FM radio DX? Nope. Now, one thing that the CP-15 did do was RX analog TV CH2. Not well, but watchable.
“I am often asked how radio works. Well, you see, wire telegraphy
is like a very long cat. You yank his tail in New York and he
meows in Los Angeles. Do you understand this? Now, radio is
exactly the same, except that there is no cat.”
-Attributed to Albert Einstein, but I ripped it from the latest Splatter .PDF March 2025 issue.

Offline Dxer92

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Re: Can you use a High Gain Dual band 2m-70cm antenna for FM DX?
« Reply #2 on: December 15, 2016, 2211 UTC »
Hmm.... it's surprising that it would not do well... On how tall the antenna is and the gain aspect. But hey, I had great luck with the Discone when I used it for FMB believe it or not. I'll just give it a shot when i get the adapter and see how she performs, I will take your word on the "Not so great" RX.

Thanks for the help!

n0loh

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Re: Can you use a High Gain Dual band 2m-70cm antenna for FM DX?
« Reply #3 on: January 12, 2017, 2033 UTC »
Most directional antennas use quarter wavelength size elements. For FM that would be around 2.39 feet. A quarter wavelength for 2m is around 19 inches, so you're probably going to lose some metal to receive a signal. I have never used a pre-amplifier, but that might help with your dual band antenna.
« Last Edit: January 12, 2017, 2037 UTC by n0loh »

Offline redhat

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Re: Can you use a High Gain Dual band 2m-70cm antenna for FM DX?
« Reply #4 on: January 13, 2017, 0437 UTC »
Why don't you just get a real antenna for FM?  Or better yet, build one?  I'm sure a 40 meter vertical will also receive some FM and vhf signals, as will your 2m/440 antenna, but not well.

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Offline Duffer

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Re: Can you use a High Gain Dual band 2m-70cm antenna for FM DX?
« Reply #5 on: January 17, 2017, 1409 UTC »
I notice Mirfield Electronics do a Quad Band 6m/4m/2m/70cm colinear  (ME64270)

It might perform slightly better on the FM broadcast band. 4m being 70MHz

 

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