I have a radio shack. i have a radio shack pro 96 digital trucking scanner.the other day we

Question

i have a radio shack pro 96 digital trucking scanner.the other day we finally put up my outside antenna for it.it worked fine all through xmas and new years.the other day turned it on and it would not pick up the channels in scan mode.i know there is nothing wrong with the scanner cause when i go to search mode and go to the cb channels and stull it picks up fine.if i go to the weather band it picks it up.i know my police and fire channels work cause when i go to manuel and go through the channels the channel they are using picks up.is it possible i could have hit a button for it not to pick up the channels in scan mode?please help