I think a cheaper and easier way to accomplish this is to use a remote coax cable switch...you can find examples of this in the ARRL handbook or buy commercial ones from various amateur radio suppliers. To try to use some sort of duplexer, you will spend a whole bunch of money and probably not be satisfied with the results you get.
An interesting question that I thought I knew the answer to; however, I looked up part 97 on the internet and guess what? 97.119 station identification and 97.205 repeater operation say nothing about requiring /r after the call sign!
I will continue looking through the rest of the rules since I obviously need a refresher!
The easiest two meter and 6 meter for that matter, antenna I ever built was made simply from coax! Take a standard piece of coax, and separate the shield from the center conductor for the appropriate antenna length for the frequency on which you choose to operate. You can hang the center conductor using a suction cup on a window and simply let the shield hang down thus creating a "vertical dipole" type of antenna. I got very respectable SWR and good talking distance with this simple antenna!
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