This is how I did it.
This is the cable I used. I think they may have a shorter one also.
I had to make a an adapter to fit the non standard Sentinel power cord. You'll need matching male and female connectors for the cable. I believe it is the "M" connector but take the 100 ft cable to Radio Shack and make sure. Ok here's where it gets confusing. I'm going to do my best to "draw" what I did in text.
Make sure you are clear as to what I did it before you get your wire cutters & soldering iron out.I'll use ( & ) for the X10 connectors and < & > for the 100 ft cord connectors.
First we need to make an adapter cord. Cut about 4-6 inches from the end of the power supply.
[]--------------------- X -------) (-[]
Sentinel power supply camera
Solder the < & > adapters to the cut ends.
* []-------------------> X <------)
Sentinel power supply Short adapter wire
Move adapter to camera end Wrap connection with electrical tape
[]--------------------> <------)(-[]
Sentinel power supply camera
You are now adapted to use the Smarthome cable I recommended above.
[]--------------------><==============><------)(-[]
Sentinel power supply 100 ft cable camera
*VERY IMPORTANT: Make that you solder the adapters so that they match when the video cables are connected to the camera.The cost of the paired video and power cables are about as cheap as just getting a 100 ft power cable. It is as easy to run the paired wire as it would be to run just a single power line. This way you have the option to have a wired video signal and not deal with possible interference with a wireless signal.
BTW... While the wireless signal is only present when the camera is on, the wired video is present all the time.