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I think there are too few of us for bot writers to bother scraping specifically for callsigns. We broadcast our callsigns whenever we key down; they're essentially just part of our names.
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Assuming that you mean a more modern military radio operating in the same band as the RT-524, then that would be a SINCGARS unit. It's meant to work with a different antenna, though the AS-1729 will probably work if you manually tune the knob on the bottom...