bmendez
Member
Is this a great spot for my anntents or no I have one on th middle of my trunk and
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Great spot or no
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bmendez
Member
Right now I have three anntents mount on the trunk of my ford fusion se
mmckenna
I ♥ Ø
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.
Conductivity to the body of the vehicle! Paint is an insulator...
Don't worry, a value added feature of a mag-mount is it slowly abrades the paint thru to bare metal and thussly improving the groundplane over time. It then provides a protective layer of oxidation over the point of contact.
Drill the hole.
belvdr
No longer interested in living
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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?
mmckenna
I ♥ Ø
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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I wasn't sure if that graphic was meant to be super accurate in terms of that or not.
or they just reversed the arrows.
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?
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
I ♥ Ø
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.
That's where it would show up, and like I said above, radiation pattern of the antenna.
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