It can be done you need to use whats called a diplexer. You need a specific diplexer that is optimised for VHF and HF. I seem to recall
that there was one such device in the Shakespeare catalog. There people who will make you a custom diplexer and make sure that its tuned correctly.
The second problem that you will have is that your 27mhz mud duck antenna will not be tuned for VHF. You will need to add a tuned stub or a parallel tuned 1/4 wave antenna so that its tuned for VHF marine
All this adds upto a lot trouble when the it would be far easier to use separate systems. The only people using this sort of multiband 1 antenna systems is mobile hams who have 1 antenna that covers several bands and want to monitor
all frequencies at once from the same antenna.
A lot of trouble to go through for little gain.
Originally Posted by rrn
hello i want to install two radios and use one antenna i know there are several posts that touch on this subject already but i am not sure if i understand properly what is being said as the technical terms confuse me sometimes so my question is can vhf and cb ssb work off the same antenna and if so do i need a certain switch and if so can someone post a link or give a name of a compatible switch thank you in advance this is such a great forum for those sailors that are not proficient in every aspect it requires to be a safe sailor