A:Answer When I scanned for antenna channels, my list was updated rather than deleted and recreated (which would remove previously found channels). I guess that depends on the TV.
But remember, it's about the signal reception---not the tv. The tv scanned for signals based on the frequency of the broadcast,and listed what it found--at one moment in time. It's just a list which allows you to select a channel. After that, the antenna receives the broadcast signal--or not. There will always be the potential for interference. Check the FCC.GOV link below and find the map which will allow you to note your distance from the broadcast antenna. If you live near the outer limits of the broadcast signal's range, you may get better reception with your antenna facing the broadcast as opposed to placing the antenna in a room away from the broadcast source.
If the list deletes and rebuilds, I would try moving your antenna to locations and scan for channels until all the channels you want are in one place. For example, in a window, or move it outside. Scan at different times of day. This may require you putting the antenna in a totally bizarre place, but your only objective is to get the channels in the list--then move it to a convenient location.
There's a rumor out there that a longer cable (longer than the one in the box) may boost the effectiveness of your Leaf. I bought a 25 ft. Cable but haven't hooked it up yet.
https://www.fcc.gov/media/engineering/dtvmaps
Hope this helps--Santa