I've looked at a number of sites including the one Andy refered to. Some
sites say it's the radio, others say it's the signal. Nothing definitive
that I've found. I'm considering a J C Whitney component to boost the
signal, so I actually opened another string on the same topic. Check
"elantra antenna signal booster" posted earlier this morning. Maybe we
can all learn something new.
Good luck; if you get this fixed please bounce somethnig back to me. If I
get the booster and it works out, I'll pass that on.