Magic antenna?
 

I have been having a problem with channel 12. I decided to flip the antenna upside down to see what happens. Now channel 12 is much better, channel 6 is still ok, but channel 2 became weaker. Do I have a magic antenna?

It helps if you tell u what antenna you are using.

There's nothing magical going on, you simply changed the orientation of the antenna which changed its reception pattern.

magic antenna
 

my diy 8 bay bowtie does magic...lol and don't have an upside down as long as its not sideways. Sounds like you need two antennas up and down.