The antenna isn't removable, but it being a 2.4ghz item, I'm sure you could rig an antenna to run it.
Running from track power is pretty simple if you run command. A bridge rectifier, large electrolytic cap, and an LM317T regulator to provide the 9 volts. You can do a similar thing with conventional, but when you interrupt power to reverse or stop, the camera will doubtless wink out for a spell.
