The previous suggestions for a modest sized all channel antenna, mounted outside are still valid.
http://forum.tvfool.com/showpost.php...37&postcount=2
http://forum.tvfool.com/showpost.php...37&postcount=5
I think you'll be wasting money on a small UHF only antenna such as the Leaf. There is no technical reason to expect it to do better with UHF signals than your existing RCA antenna... And the Leaf lacks the VHF capability of the RCA.
If you want something to work inside, you've shown that a small indoor antenna is inadequate. So, you'll need to consider using a mid-size all channel antenna (an outdoor design). In the attic, the Antennacraft C490 would be an example.