The Driveway alarm is easy to modify. Just take the screws out which hold the front and back together. Then carefully work them apart. They use hot glue to hold the antenna wire in place and it may be sticking the two pieces together a little. Once you have it apart, you will see the antenna wire, it is white. It will run up over the inside top of both the sender unit and receiving unit. Work it loose from the hot glue holding it being careful to not break the wire.
I took the wire from off the top and drilled a small hole out the side of the units where the antenna wire originates.
I then soldered it to an 18 inch piece of 12 guage solid wire. I just stripped off about half inch of the insulation on the 12 guage wire from the bottom for the solder job. After soldering I used some heat shrink to cover the solder and bare wire.
While you have the unit apart, if you want to install a way to use the earphones and external volume control, you will see the red and black wires going to the speaker. Just cut them close to the speaker. I removed the speaker on 6mm06's unit and drilled about a 1/4 inch hole for the wires to go through. I then soldered a female 3.5mm plug to the wires so that he could plug in his volume control and headphones.
Then just put the unit back together and use wiring ties to hold the antennas to each unit and keep them vertical. I used the black 12 guage wire on the outside unit and the white wire on the inside unit, but it really wouldn't make any difference other than visibility.
I also bought one of those Sterilite containers with the snap lid from Walmart. I think it is the quart size. I used that to make a box to protect the outside unit. I mounted it to a board and put a strap between the plastic housing and the board for mounting to a post or tree. I then cutout the front of the housing enough for the sensor to read and put a hole in the top of the container just large enough for the antenna to come through.
The top screw which holds the housing to the board is also used as the mounting screw for the sending unit, so it needs to be placed so that it can do double duty. I put a second screw in the bottom of the housing to hold it to the board. Then I drilled (4) 1/4" holes at the front bottom of the container to let any rainwater get out and camoed the lid and container before putting the sending unit in it. If you go back and look at 6mm06's pictures it might make more sense now.
If that doesn't do it for you, send me a PM and I'll take one apart and make some step by step pictures. I hope this helps you out.
