I think I got a bad massage across, somehow. In no way am I complaining about range or X-10. With the RF in the basement I get very good results throughout the house. (Little note: Pulled unused repeater out of box, stuck in attic, tried out in garage and it does bring the garage signals into the house and CM15A quite nicely.) My confusion was really why the in-house items seem (DO!) to work better the lower they are. I have tried many antenna placements, all the way to the point of re-orienting the plug that the CM15A is located in. This was simple in attic and basement cause the box was external so I could remove from wall joist and mount how I wanted. The antenna position makes a difference, but not as great a difference as the height of the unit.
Strangely, I seen to get the best receive distance with the antenna vertical, but when using the transmit (Which is rare, I'll admit) the best range seems to be horizontal. Actually a little off horizontal.... Seeing that most of what I want the CM15 to do is receive, I leave the antenna almost vertical.
The "Smart" repeater is great for Normal signals, but seems to ignore security signals. The keyfobs, sensors and security motion sensors seem to be ignored by it. (Has the "receive" LED and "Transmit" LED). So now I can use a palmpad in the garage, which I'll probably never do, other than for testing, and the alarm keyfobs won't work outside because the repeater doesn't act on them......
Sooner or later, I'll find a method of getting both to work from outside and inside without interference. For Now, This is fine.
Thanks for suggestions and info. Gotta go to work, so further checks and tests get put on back burner for day or so.
Little Note to Billaban: The quote you mentioned, I had read it before, but now I remember..... The new siding on the house was leveled do the misc. methods used to construct the house. The leveling was done with that styrofoam with "FOIL" on both sides. (I really missed that one till just now). Sometimes it takes a lot of pounding to get ideas into my head. I'll check to see if the house or siding is slighttly conductive. This would RF seal the sides of the house, leaving the attic free to radiate outward through the roof.
I should have thought of this sooner. Thanks again.....