The "1 edge/2 edge" stuff means it has to bounce off of something before getting to you. Such as a mountain, or a ridge of some sort. It might not even be a noticeable mountain. It could be something as simple as the elevation of the tower in Dallas, versus where your house is located. Perhaps THEY or YOU are mighty lower or higher, so that makes them be too low below the horizon to be able to compensate for true "line of sight".
I see Dallas is around 430ft of elevation. Add that to the height of their tv tower. Then, you have your elevation at your house? Nederland? That's only 16ft elevation. Anyway, it might be far enough distance away that the Earth itself rises/rounds up and gets in the way of the signal.
Ok, thank you, I think I understand it a little better now.
However it's not Dallas I'm aiming for it's Houston. Dallas is like 450 miles away, there's no way in the world to pick them up.
Houston (the towers) are 93 miles away and they are very close to the coast like I am so I think their elevation is going to be close to mine.
As for the towers there it appears that there are about 5 of them clustered within like maybe a 1/4 mile area and they all seem to be about 1,900 feet tall, plus or minus a few dozen feet.
Also it seems there are about 75 channels coming in on those assorted towers. Most of them I have no interest in, there's maybe at best 10 channels that I would ever care about.
I haven't taken the time to get the signal strength maps for all of them, I don't see any point in it because I'm going to assume they are all going to be similar since all the towers are close to each other and about the same heights.
http://www.rabbitears.info/market.php?mktid=13
http://www.rabbitears.info/locationmap.php?request=location&location=Missouri+City+(TX)
On the other hand there are the locals to my area and those come in like gangbusters.
http://www.rabbitears.info/market.php?mktid=174
And get this, all day long it's been raining and all day long Houston stations have been coming great.
So the clouds are reflecting the signal back down to this area?
One thing that really has me worried is that a little hick station in the sticks, KAOB-LD seems to have gone off the air a few days ago.
I've been getting PBJ on 27.5 but like just days after I put up my good antenna, POOF! Gone...
That reminds me of the same thing that happened when I fought so hard to get White Springs, I had soooooo many problems
but by the time I got them all figured out and fixed, they went off the air. I hope this isn't a repeat of that.
I still don't have my big dish up so I was depending on KAOB for PBJ. I can't really put the big dish up yet because I'm going to have to get new siding on the house soon
and I don't want workers trashing my dishes or knocking the poles out of alignment so I have to wait until that's taken care of.
All this OTA antenna stuff is pretty much new to me, I haven't put any effort into learning about it until just recently and I really know very little about it.
I doubt I'll ever understand how it all works, I figure that at best I'll be able to copy antennas I find pictures of in google images.
It's not easy trying to figure this out and make it work when you don't understand how it works.
Like the Chinese girl assembling iPhones, she can put one together but has no idea what makes it tick inside. That's going to be the limits of my skills in this stuff.