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Cross bars

Delivers1234

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Trailsport 2025,
I have cross bars on the luggage bars. I would like to drill the cross bar to run an nmo for gmrs and add a small aluminum sheet square to it. I could use u bolts to hold the sheet to the cross bar.

Any issues? How large of a square should I get the sheet? 4x4 inches etc?

Delivers1234
 

mmckenna

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Trailsport 2025,
I have cross bars on the luggage bars. I would like to drill the cross bar to run an nmo for gmrs and add a small aluminum sheet square to it. I could use u bolts to hold the sheet to the cross bar.

Any issues? How large of a square should I get the sheet? 4x4 inches etc?

Delivers1234

That should work just fine. Only challenge is getting the coaxial cable into your vehicle.

The ground plane under the antenna would need to be 1/4 wavelength in all directions under the antenna. That would be a 12 inch by 12 inch sheet of aluminum, or a circle 12" in diameter.

Or, consider a 1/2 wave antenna that does not require a ground plane (but works better with one).
 
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