Wizenet welcome to the boards and X10. After you take a look at TTA's suggested reading which is an excellent source for information you can take a look at RoboDog vs EagleEye MS Detection Sensitivity Question (Read 2224 times) (http://www.x10community.com/forums/index.php?topic=10982.0) it talks a bit about adding a passive antenna to a motion sensor.
(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)---(http://www.bdshost.com/X10/lpup.gif)----KDR
[TTA Edit: Formatted the LINK to BOLD & BLUE, to make it easier for Newbies to spot. ;) ]