-"A fish rots from the head" Chinese saying
-"A radio rots from the electrolytic caps" Ham saying
Smelly caps, and a burnt antenna are called "CLUES". Don't try and rationalize why they can't possibly be bad. They are. Something bad happened. Maybe more than one bad thing.
Replace the caps. Test if you want to, but don't avoid replacing them or put power on the radio until they are replaced and you have gone through the entire radio visually,and with that good sniffer of yours.
Best pull the antenna and coax and do visual and VOM checks too.
At least you discovered the problem before something caught fire or burned up; maybe while you were out of the house. 73, bill
 p.s. Read the eham reviews on, the TRAM 1481 n.b. water leaks, soaked spacers and blown capacitor. Much to check out on your antenna. http://www.eham.net/reviews/detail/4203