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Great spot or no

mmckenna

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Is this a great spot for my anntents or no
No, not a great spot. Ideal location, as shown on the Larsen placement guide above, is center of the vehicle roof. You are losing 2.8dB or more on the trunk, and that means about half your signal.

But, if it's what works for you, then it's fine. If you have an itchy drill finger, then pop a hole in the center of the roof and enjoy some better performance.
 

mrweather

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How is it that a permanent NMO mount on the trunk lid has worse loss than a mag mount in the same position?
 

belvdr

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Conductivity to the body of the vehicle! Paint is an insulator...
I think the question was confusing. The graphic shows a loss of -2.1dB for mag mounts and -2.8dB for a permanent mount. Why is there increased loss for a permanent mount?
 

mmckenna

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I think the question was confusing. The graphic shows a loss of -2.1dB for mag mounts and -2.8dB for a permanent mount. Why is there increased loss for a permanent mount?
Location, location, location.

If you look at the photo, the permanent mount is closer to the rear window. That puts it farther in the shadow of the roof, tinted windows (sometimes use metallic film), and/or defroster wires. Looks like the mag mount is farther back on the trunk lid.
 

belvdr

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Location, location, location.

If you look at the photo, the permanent mount is closer to the rear window. That puts it farther in the shadow of the roof, tinted windows (sometimes use metallic film), and/or defroster wires. Looks like the mag mount is farther back on the trunk lid.
I wasn't sure if that graphic was meant to be super accurate in terms of that or not.
 

mrweather

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Ultimately, a difference of 0.7 dB is pretty much a wash when it comes to what you hear coming out of the speaker.

In my personal experience, my car has permanent NMO mounts on the trunk and roof, and I did not observe any appreciable difference in receivable signal using the same antenna in either location. Maybe it's more of an issue for fringe reception?
 

mmckenna

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I did not observe any appreciable difference in receivable signal using the same antenna in either location.
Not surprising. It becomes more of an issue when transmitting and you have the antenna close to a tinted or defroster'd back window. Reflections can screw up SWR. Radiation pattern will also be impacted. But if it works for you, then go with it.

Maybe it's more of an issue for fringe reception?
That's where it would show up, and like I said above, radiation pattern of the antenna.
 
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