The following URL is for the instruction manual for the Star Roamer which will show the connections for the radio:
http://bama.edebris.com/manuals/knight/str-rmr/
A random 25 to 100 ft. wire run outdoors will serve fine as a substitute for a CB antenna.
If your 6AK6 and 6BE6 tubes are defective, Electron Tube Enterprises (
www.etetubes.com) is a good source for replacements.