Tuesday night, KBTX Engineers will turn off the analog off-air signal for a few hours in order to perform maintenance on the tower located near 29th Street and Carter Creek. The signal will go off at approximately 11:37pm after The Late Show with David Letterman. It will resume around 1:30am, Wednesday morning. Engineers say satellite and cable viewers will see regular programming and will not be affected. Those receiving the High Definition signal with an HD antenna may experience momentary interference.