[SWHouston]

Greetings mh74,

That's not the best chart I've ever seen !
But, I can't tell what height you entered initially for it.
With a three story house, and if you could put an Antenna on the Roof, you could possibly enter as much as 25/30 ft for the install height.
Why don't you redo your chart with a more exact hight number for a Roof mount, and see if it doesn't help the reception values.

Most times, when you get a 1 or 2Edge, it's because that something (hill/building) is in the way. So, additional height could resolve that.
And yes, I'd say at this point, an indoor Antenna wouldn't provide you with a very good signal at all.

Have a good Day !
S.W.