Howdy----been using an S3 for years and decided to try the Roamio basic for OTA only. Signal levels on the S3 mostly 92 to 99 with a couple in the 70's to 82 Using the exact same feed, the Roamio got 72 on the same channels the S3 got 92-99 (it got 72 on all of these channels, it won't go above 72) and on the channels on S3 that got in the 70's to low 80's, the Roamio got high 40's mid 50's. Where there was little to no breakup on the S3 on the lower signal channels, there was a much more frequent breakup on the Roamio. I got a replacement Roamio to see if it was just the tuner in the 1st unit and the replacement had the same signal readings and breakup. Technical had no clue and a customer service supervisor actually said "the Roamio is newer technology and is digital whereas the S3 is "analog" so the Roamio is better and needs a better antenna". I've been a Tivo fan for years. I had one of there original units and went with directv only because they had the Tivo HD-250 of which I had 2. Sorry to say, when my S3 fails (beyond a hard drive replacement) unless something changes, that will be it for me and Tivo.