FM antenna

Discuss commercial and home made antennas.
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aurgathor
Posts: 82
Joined: Wed Apr 25, 2018 8:14 am

FM antenna

Post by aurgathor » Sat Nov 16, 2019 12:45 pm

I want to get an omnidirectional, outdoor FM antenna (88..108MHz) and wonder if people have any experience with some of the antennas showed here: https://antennaguide.top/ooudoor-fm-am-antenna/ or anything comparable.
Looking at some of the reviews, some people claim the "Stellar Labs Outdoor FM Antenna" (apparently, a folded dipole) is junk, but others seem to love it.

Gain isn't terribly important, I mainly want an antenna above my metal roof, not underneath.

Username
Posts: 503
Joined: Sun Oct 09, 2016 7:27 am

Re: FM antenna

Post by Username » Sat Nov 16, 2019 1:07 pm

Sry that TDL is blocked do you have a normal one to look inside?

aurgathor
Posts: 82
Joined: Wed Apr 25, 2018 8:14 am

Re: FM antenna

Post by aurgathor » Sat Nov 16, 2019 8:16 pm

What do you mean about "TDL"? The link I provided?

If so, use these search terms: "Winegard HD-6010" and "Stellar Labs Outdoor FM Antenna"

Username
Posts: 503
Joined: Sun Oct 09, 2016 7:27 am

Re: FM antenna

Post by Username » Sat Nov 16, 2019 9:43 pm


snn47
Posts: 192
Joined: Tue Dec 27, 2016 11:00 pm

Re: FM antenna

Post by snn47 » Sun Nov 17, 2019 10:42 am

Looking at the link I am confused to find mainly recommendations for horizontally polarized antennas for FM-BC. Only TV-BC antenna use to my knowledge horizontal polarization.

Passive car antennas for FM-BC have been by design vertically, until preamplifier were cheapenough to shorten antenna. In Europe vertically polarization with optional horizontally polarized EIRP added to improve car reception during e.g. multipath or other effects. Unless your FM-BC transmitter antennas in your country, a really predominantly horizontally polarized transmission vertical polarization is more likely.

A groundplane like shown Image on the top of mast should suffice.

If you need best performance a vertically mounted directional antenna and a rotor are your best option.

Due to the large variation in wavelength most antenna will not provide similar gain and pattern on all frequencies, unless they are by design broadband enough to cover 87.5 to 108 MHz like e.g. Log-perodic, bi-cone or disconeantenna.

Username
Posts: 503
Joined: Sun Oct 09, 2016 7:27 am

Re: FM antenna

Post by Username » Sun Nov 17, 2019 10:57 am

In the past such Yagi Antenna was used in Europe: https://www.radiomuseum.org/r/rim_16_el ... 80371.html
Often the can see nower days but the get not connected any more.

snn47
Posts: 192
Joined: Tue Dec 27, 2016 11:00 pm

Re: FM antenna

Post by snn47 » Sun Nov 17, 2019 11:51 am

Username wrote:
Sun Nov 17, 2019 10:57 am
In the past such Yagi Antenna was used in Europe: https://www.radiomuseum.org/r/rim_16_el ... 80371.html
Often the can see nower days but the get not connected any more.
Have you also read the the designated use of this antenna is Fernsehempfang which is TV-BC, but not FM-BC?
16-Element-Yagi-Uda-Antenne für den Fernsehempfang mit 10 - 13 db Gewinn, Mastmontage.

Username
Posts: 503
Joined: Sun Oct 09, 2016 7:27 am

Re: FM antenna

Post by Username » Sun Nov 17, 2019 1:50 pm

Well TV was send on lower VHF Band back then "next" to the Radio Band. Since Radio is transmit with a HUGE Output Power (since a SDR would not need dedicated Radio Band Filter) on a small Area normally nobody need a perfect Matched Radio Only Yagi Antenna. :lol:

aurgathor
Posts: 82
Joined: Wed Apr 25, 2018 8:14 am

Re: FM antenna

Post by aurgathor » Wed Nov 27, 2019 1:35 am

Username wrote:
Sun Nov 17, 2019 10:57 am
In the past such Yagi Antenna was used in Europe:
Most Yagis (retail) are highly directional and I specifically want an omnidirectional antenna since there are FM towers in all 4 quadrants. An antenna for (US) Ch6 should work fine on FM, but TV antennas in general are directional or highly directional, plus I think there are much less antennas today than there were a few decades ago.

VE3EAR
Posts: 11
Joined: Sat Oct 05, 2019 10:13 pm

Re: FM antenna

Post by VE3EAR » Wed Nov 27, 2019 2:27 am

You could build a "halo" antenna without too much trouble or expense.

https://www.google.com/search?q=FM+broa ... 7rEfSQIR-M:

73, Bruce, VE3EAR

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