Does Dynon sell antennas and the antenna cable(s) for the new Dynon transponders?
Dynon does not (currently) sell either the coaxial cable or an external antenna required for the transponders. You will need to purchase these items from an avionics supply company such as > Aircraft Spruce. The SkyView Installation Guide (revision E for software v2.6) has a new section on the installation of the transponders, including some information on selection, placement, and installation of transponder antennas and the antenna cable.