This article has restoration notes for that TV.
http://www.antiqueradio.org/rca16.htm
There should be a pair of screw terminals in the back where you can attach a rabbit ear antenna.
Kind of a tricky project if you are a beginner. I would recommend getting help from one of your engineering friends. Don't power it back up in the meantime. Every tube device of that vintage needs more than a tube replacement to work safely and reliably.
Regards,
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html