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There are benefits to cophasing.  If properly spaced apart they can provide directionality (best done on a base although can be achieved on a mobile) and they can provide a more consistent pattern that is less influenced by the body of the vehicle on a mobile install.


attached is my reference hope this helps out other's may have some more info on this.


The Ultimate Guide to 11 Meter CB Antennas


hope this helps out or stimulates more input.


p.s. forgot to mention the added gain from cophasing.