This instructable will show you how to increase the range on any car key remote.
Step 1: Get Inside It
Lets start by using a small flat screwdriver and pry the key remote open. Then locate the antenna(it looks like a small silver box). Then using sandpaper lightly scrape off some if the silver coating.
Step 2: Adding Some Wire
Now solder a small length of wire to that antenna. Then close it up.
Step 3: Try It Out
Now try it out. You should get almost 40-50 added distance and it still works.