It is a pretty common request to place a leader that has no text associated with it. Common enough, but not an obvious enough solution. This outlines how to use an existing family that Scott Brown made ages ago and shared at AUGI, in fact he most likely shared it before that when the forums were part of Zoogdesign. Even possible that he shared it at Alt.cad.revit. It's got some history...well traveled! Thanks Scott!! I can't post a file to share here as far as I know so I'll provide a link here to the thread at AUGI that has the file. If you log into AUGI first you'll just be prompted for a place to save the file, otherwise you be prompted to log in first. If you aren't a member, it is free!
Here's how to use it
Load it into your project File > Load From Library > Load Family
Drafting > Symbol > Choose symbol name: Leader Only
From the Options Bar, Select the number of leaders
After you place it, Select it, Edit Properties and assign the arrowhead type you want