Probably say NASA tv, that was the #1 reason I finally decided to buy a dvb receiver. When NASA dumped the analog feed which I had watched for years, I had to go for it. And after that, the RTN channels. I finally just hooked up a sep dish/receiver for NASA so I wouldn't have to switch things.
Now all I have to do is push the input button on the tv remote to go from reg FTA to NASA FTA, don't even have OTA channels hooked up often.