voltage on the FM antenna terminals?!

[Hemingray]

Well, finally recapped my RCA Victor AM/FM radio today (See other post to see this radio). Started on testing her out after that, and does she sound wonderful! However, when the rabbit ears I was using to test it fell over, one dipole contacted the top of the computer next to it. When that happened, there was a bright spark, a loud snap and the GFCI the radio is plugged into tripped out. What would have caused this to happen? The rabbit ear antenna now has a huge black spot where it sparked out. Did I inadvertently short something?