Yes, you can get a shorter antenna on your truck. In fact, there are a few different ways to do this. One option is to simply buy a shorter antenna. Many companies make antennas specifically for trucks that are shorter than the standard size. Another option is to cut down a standard antenna to the desired length. This can be done with a hacksaw or other similar tool. Finally, you could also build your own custom antenna using materials such as copper pipe or aluminum tubing.