Thank you Mark.

I have the antenna mounted as high on the closest wall as the cable will allow.

However, I do not have a metal surface behind it - only sheet rock.

There is nothing directly interfering with the antenna, but there are some bookshelves on the wall opposite to it going into the rest of the house.

So, a 19db omni should make a big difference?

Any other pointers? settings tweaks?

Thanks!!
John