Where to place GPS and XM antenna
We just bought a 2009 Mandalay 43A. I'd like to install an in-dash AM/FM/XM/CD Navigation unit; something like the AVIC series from Pioneer. My question is this: What's the best way to mount the two a...
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The GPS antenna is less critical than the XM antenna because of the number and location of the satellites. However placement needs to try and minimize the masking that can occur whenever there is metal between the antenna and the satellite. I moved my antennas to the very front of the dash right under the bottom edge of the windshield on my Roadtrek to improve reception and it really helped. With the factory placement there were times when I'd loose even GPS reception in places like SW Texas.
Masking of satellites is also done in the GPS software in the unit when it determines the satellite is to low on the horizon. Not sure if XM does this but I'm guessing they don't. Masking means the receiver can't receive the signal because of something blocking the signal, like the metal cab. In software it means the received signal isn't used, it is ignored since it may be of low quality or a reflected signal rather than one directly received. This is important in GPS navigation.
BTW, if you're a Garmin user you may not like the in-dash units based on TomTom. I was so frustrated with the one that came in my Roadtrek that I replaced it with a Kenwood/Garmin unit and I'm much happier with it.
Masking of satellites is also done in the GPS software in the unit when it determines the satellite is to low on the horizon. Not sure if XM does this but I'm guessing they don't. Masking means the receiver can't receive the signal because of something blocking the signal, like the metal cab. In software it means the received signal isn't used, it is ignored since it may be of low quality or a reflected signal rather than one directly received. This is important in GPS navigation.
BTW, if you're a Garmin user you may not like the in-dash units based on TomTom. I was so frustrated with the one that came in my Roadtrek that I replaced it with a Kenwood/Garmin unit and I'm much happier with it.
