metal roof and FM reception

Discussion in 'Tuners' started by stoutblock, May 17, 2018.

  1. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

    Messages:
    9,535
    Location:
    Northwest USA
    I recently replaced a composite roof with a new metal roof on my home. I was a little concerned it may negatively affect the FM reception in my office where I just use a simple di-pole on an external wall. To my surprise, with no other changes, the reception on my Yamaha T-2 is better than it has ever been. Up a good 30% higher on the meter and really solid improvements on every station I listen to. Go figure?
     

     

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  2. c.coyle

    c.coyle AK Subscriber Subscriber

    Messages:
    3,081
    Location:
    40.333434 -76.423714
    Not surprised. Indoor VHF antennas are a crapshoot. It would be interesting, but no longer possible, to compare the directional pattern of your dipole, old roof versus new roof.
     
  3. amptramp

    amptramp Active Member

    Messages:
    396
    Location:
    Mississauga Ontario Canada
    Is your roof grounded?
     
  4. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    7,090
    Location:
    northern cal.
    Ground plane. :smoke:
     
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  5. Silentnet

    Silentnet AK Subscriber Subscriber

    Messages:
    745
    Location:
    Charleston, SC
    I know the metal roof on my house /destroys/ cell reception. Haven't listened to FM though. Might hook up the antenna to the Emotiva when I get home.
     
  6. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

    Messages:
    9,535
    Location:
    Northwest USA
    Living in a fairly urban area where stations are located in all directions from where I live. In my main system I have a Yamaha CT-7000 that works very well with an external Omni-directional whip antenna that is about 20' from the house and about 25' elevated. It already had excellent reception and does not seem to be effected by the new roof. The T-2 with the internal di-pole is now very comparable in reception to the CT-7000 setup.

    No, not required per code here.

    That is what I was thinking. My office is on the second floor overlooking an attached garage. Both the roof above the office and the roof above the garage are now metal. The di-pole is mounted on the external wall beside and above the garage which places it between both roofs but not necessarily masked by either one. I think it may be a combination of reflector and/or ground plane that is helping the signal? It any case, it works quite well. I'm now picking up a weak signal from a college in Bellevue that I really enjoy. I could barely even pick up the signal before on the T-2.
     
    Last edited: May 17, 2018
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  7. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    7,090
    Location:
    northern cal.
    I moved my external 1/2 wave omni from the comp roof of the house to the top point on the front of my garage. The garage has a metal roof. Reception improved. Reflection may have been a factor.
     
  8. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,162
    Location:
    Fort Dodge, Iowa
    I have a metal roof as well. I haven't had any issues with FM or cell phone.My gear is setup in the basement service bench/mancave. The HD high tech antenna for my tuners is three 18" alligator clipped jumpers. Clipped end to end.. Attached to one of the 300Ω terminal screws of my Marantz 2100.I like the soft blue lights. :rolleyes:My T1 and T-7 are both down for maintenance.The other end is clipped to a nail behind a framed litho.:thumbsup:
    Good enough for my needs. Local FM reception is super. AM has always sucked around here.
     
    Last edited: May 17, 2018
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  9. R-2-R

    R-2-R AK Subscriber Subscriber

    Messages:
    2,078
    Interesting......I also had thought about replacing our shingle roof with a metal roof.

     
  10. Silentnet

    Silentnet AK Subscriber Subscriber

    Messages:
    745
    Location:
    Charleston, SC
    It can be very loud when it rains. Just something to consider.
     
  11. Djcoolray

    Djcoolray Addicted Member

    Messages:
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    Location:
    A rocks throw from JBLM !!!!
    It may be that that metal roofs are attracting the FM signal and holding a large amount of the signal just like an antenna...
     

     

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  12. R-2-R

    R-2-R AK Subscriber Subscriber

    Messages:
    2,078
    Yea I had already considered that along with other factors, since my sister-in-law and her husband's country ranch style house has a metal roof.

     
  13. stoutblock

    stoutblock If it sounds good, it is good... Subscriber

    Messages:
    9,535
    Location:
    Northwest USA
    Not in my case. It sounds a little different but it is not louder during a hard rain. I think it is actually a little quieter in a drizzle compared to composite roof. It also has a benefit to keeping the house cooler in the summertime sun because it reflects a lot of the heat.

    I'm sure there are some real radio wave energy physics going on but the specifics are total conjecture on my part. It is a dramatic improvement and I no longer have any interest in going to an external antenna in my office now.
     
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