Hi all,

I am new to the world of X10 but I have been playing with computers and ham radio since the 80s.

I build a quarter wave ground plane antenna for my cm15a and did the external connector mod. I used a 50 ohm bnc connector rather than a 75 ohm f connector. I ran 50 ohm coax from the antenna with pl-259 connectors and used a converter to go from bnc to pl-259.

My thought was to keep the impedance at 50 ohm.(I think I read that is supposed to be 50 ohms, If that is wrong please correct me.)

From my calculations for the length of the antenna radials I came up with 9.06 inches for a 1/4 wave.

The formula for the radial length is the speed of light divided by mhz to get the full wave size. Then divide the full wave size by 1/2, 1/4 or 1/8 for the size of antenna you want to build, but I am lazy and I used The Amateur Quarter Wave Ground Plane Antenna Calculator site.

http://www.csgnetwork.com/antennagpcalc.html I have the antenna hanging in the attic.

I am picking up all of my ds10s inside my house, but I am not seeing any of my eagle eyes or active eyes that are outside of the house. They are at most about 60' from the antenna. I have set house codes to B and allowed for 2 number for each motion sensor. Any ideas of what I have done wrong?