Wing-Ding

I guess it all depends how you assess risk. And that is going to vary depending upon people's soldering skills. Replacement of an antenna by someone who may not possess good soldering skills may indeed cause a cold solder joint or solder splash or loose piece of solder rolling around in the receiver that may cause intermittent operation. Any problems caused by a poor re-soldering of the antenna wire may not be manifest right away- in which case someone would fly the plane.

If you feel confident in your soldering ability, and can open the receiver case without causing any damage, then I think the best course is to replace the entire antenna. If you feel unsure of your soldering skills, then I would recommend repairing the antenna as was described in previous posts.