Aviation Nut,
If it was just an inch or two, I would do a decent range check as I mentioned earlier. If it checks out alright, don't worry too much about it. Just don't fly out or high enough for the plane to become a speck.

You CAN solder on a new antenna wire (same gauge as Minn stated), but you need to be competent at soldering. Soldering a
piece back on can also be done. In either case, range check it after!

It can also be sent back to the manufacturer for a new one.

Mike,
Can you rotate the engine mount about 45 degrees counter-clockwise? It will often cure the muffler issue.
Dennis-