The recent TiVo software update to 9.3 had a bug for those TiVo users still using antenna. If you had your Series2 TiVo set for just Antenna or Satellite & Antenna and you did a ‘Repeat Guided Setup’ after receiving the new software, you’d be stuck. There is a procedure to unstick the unit if this happens.
TiVo is now pushing 9.3c out to Series2 users, with a priority for those who have antenna as one of their sources, with a bug fix for this problem.
Thanks to Dave Zatz for the tip via email.