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Yes of course aluminum conducts, it is the fourth best conductor right behind silver, copper, and gold. For a mount that will have a very large contact area, it performs as well as a steel mount does.
And a no-groundplane antenna is a VERY poor antenna designed only for use where there is no steel to mount the antenna on on. Like a fiberglass or wood boat, or fiberglass aircraft. It "gets along" without a steel mount but barely.
No-groundplane antennas are about the worst performing type of full size antenna you can find, and have no better than 50% of the performance of a traditional ground plane antenna. This is because with a groundplane antenna, the vehicle electrically becomes half of the antenna system, called a counterpoise, which doubles the effective size of the antenna.
No-groundplane antennas "work" and that's all that fiberglass boats can use but they are a very (!) poor performing antenna when compared to a traditional groundplane antenna.
So for a Jeep that has a steel tub, steel bumpers, steel frame, etc., you would not want to use a no-groundplane antenna unless you just like having a very poor performing antenna. They "work" but not nearly as well as a traditional groundplane antenna does.
And a no-groundplane antenna is a VERY poor antenna designed only for use where there is no steel to mount the antenna on on. Like a fiberglass or wood boat, or fiberglass aircraft. It "gets along" without a steel mount but barely.
No-groundplane antennas are about the worst performing type of full size antenna you can find, and have no better than 50% of the performance of a traditional ground plane antenna. This is because with a groundplane antenna, the vehicle electrically becomes half of the antenna system, called a counterpoise, which doubles the effective size of the antenna.
No-groundplane antennas "work" and that's all that fiberglass boats can use but they are a very (!) poor performing antenna when compared to a traditional groundplane antenna.
So for a Jeep that has a steel tub, steel bumpers, steel frame, etc., you would not want to use a no-groundplane antenna unless you just like having a very poor performing antenna. They "work" but not nearly as well as a traditional groundplane antenna does.
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