The Astros have announced that their games will be broadcast on KBME (Sports Talk 790) for 2013, even if we don't know exactly who will be announcing them.
Chronicle Deputy Sports Editor Reid Laymance notes that KTRH was a 50,000-watt station, and KBME is a 5,000-watt station. How does that affect you? Well, here's KBME's nighttime coverage map: