In most cases you will still need an antenna to continue watching KBTX, over-the-air now that we have moved to using only our digital signal..
Generally, the same antenna that currently provides good quality reception on an analog TV set will also provide good DTV reception, but this is not always the case. The type of antenna you need for digital reception depends on several factors, including how far you are from the transmitting station, where your antenna is located and in which frequency band (VHF or UHF) the stations are that you want to watch. KBTX is broadcasting it's digital signal in the UHF Band.
To determine the antenna that is best for you, go to www.antennaweb.org. Based on geographical maps and signal strengths, AntennaWeb locates the best antenna for you — whether the antenna is for use with a home satellite system, high-definition television (HDTV) or a traditional analog set.