kidphc

You will lose range. The antenna will also transmit more directionally. Be slightly more deaf and often have much higher swr, due to the weird shaped/smaller ground plane (compared to the roof).

If range is a concern. Then center of the roof with a high gain antenna, is the optimal answer, almost always.

The cab (windshield and a pillar) will partially shield the signal. Not to mention the 2-3 foot difference in height. The ground plane differences lead to 2db or greater loss compared to a center roof mount. Remember, to get 3db gain (roughly one signal bar) you have to double the power with everything else equal roughly speaking.

Comparably, although it is not as bad as you think. My hood mount antenna hears about 60-75 percent of what it did on center of the roof. Transmits about 75-80 of the center roof mount.

Hence why we always recommend grabbing the drill and mount a nmo. When you do no ground plane antennas, stealth antennas, mag mounts, sub optimal locations. You take a comprimse and add more comprimises. Really comes down to what you can live with.

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Least amount of loss, aircore hard line. Like heliax. Usually, used on repeaters. Avg $2-7 a foot.

Most commonly used for 100ft. Probably lmr400. Acceptable cost and acceptable losses. Avg $1-4 a foot. You could also look at lmr600, but it gets to aircore levels of stiffness, which can make routing difficult.

Keep in mind the connectors also come into play. Really high quality "n" connectors can average $25 each.

So it's best to set the budget. Your expectations and meet in the middle or what you are comfortable with.




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Rfi, or installation issue from the electronics running on the car.

Seems like the shielding is kinda crappy on alot of Chrysler products. Turn off the car and rfi is gone. Some times the delayed accesories can still introduce noise till about 5minutes after shut off.

Your coax can act as a big antenna, routing can make a difference. Generally, a good practice in mobile installs is to keep the coax ad far away from power and canbus lines as possible. Cross those lines if possible at 90 degrees with the coax.



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They do make power port passive diplexers. Not sure if that will help. The satellite hams sometimes but rarely use something similar. Not sure if that is any help. I don't know enough about the topic to really offer much. But this might lead you down the path till someone can chime in. Note this is 75 ohms.. really for satellite dishes not ham/gmrs use.
 
https://www.summitsource.com/Channel-Master-4001IFD-Satellite-Diplexer-Separator-Mixer-VHFUHF-CM4001IFD-950-2150-with-DC-Pass-High-Performance-In-line-IF-Satellite-Diplexer-Digital-Video-Signal-Part-4001-IFD-P11530.aspx