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Neither your vehicle's roof or frame need a connection to the negative terminal of the battery for the antenna to work. Further, weather or not there is a good connection between the roof/frame to the battery makes absolutely no difference in how a mobile antenna functions. The ground terminal on the battery has nothing to do with a ground plane. In most vehicles you will have this connection simply because that is how vehicles are designed, but it is not required.

A connection between the frame and roof is also not required, however it is a good thing. That being said, simply having a 0 ohm connection as reported by a multimeter is not always enough, and to be sure it needs to be properly RF bonded.

As stated above, RF acts different than the DC a multimeter uses for continuity testing. You cannot assume that a 0 ohm connection reported by a multimeter will be 0 ohms at 27 MHz.

The DB

<blockquote data-quote="The DB" data-source="post: 534129" data-attributes="member: 21346">Neither your vehicle&#039;s roof or frame need a connection to the negative terminal of the battery for the antenna to work.&nbsp; Further, weather or not there is a good connection between the roof/frame to the battery makes absolutely no difference in how a mobile antenna functions.&nbsp; The ground terminal on the battery has nothing to do with a ground plane.&nbsp; In most vehicles you will have this connection simply because that is how vehicles are designed, but it is not required.A connection between the frame and roof is also not required, however it is a good thing.&nbsp; That being said, simply having a 0 ohm connection as reported by a multimeter is not always enough, and to be sure it needs to be properly RF bonded.As stated above, RF acts different than the DC a multimeter uses for continuity testing.&nbsp; You cannot assume that a 0 ohm connection reported by a multimeter will be 0 ohms at 27 MHz.<a href="http://hittman.us" target="_blank">The DB</a></blockquote>

[QUOTE="The DB, post: 534129, member: 21346"] Neither your vehicle's roof or frame need a connection to the negative terminal of the battery for the antenna to work. Further, weather or not there is a good connection between the roof/frame to the battery makes absolutely no difference in how a mobile antenna functions. The ground terminal on the battery has nothing to do with a ground plane. In most vehicles you will have this connection simply because that is how vehicles are designed, but it is not required. A connection between the frame and roof is also not required, however it is a good thing. That being said, simply having a 0 ohm connection as reported by a multimeter is not always enough, and to be sure it needs to be properly RF bonded. As stated above, RF acts different than the DC a multimeter uses for continuity testing. You cannot assume that a 0 ohm connection reported by a multimeter will be 0 ohms at 27 MHz. [URL='http://hittman.us'][COLOR=#000000]The DB[/COLOR][/URL] [/QUOTE]

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