I once took the antenna wire (white) and cut the antenna out. Then I soldered a flat sheet of metal (copper or aluminum is good) to it. It could help. It did for me.
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The problem with short ranges is that the transmitter is very weak. If you change the transmitter for a more powerful one you can control your car until it's out of sight. I'm talking about a transmitter where you buy the trans. by itself not everything as a set. You might get a little more range if you make both of your antennas longer but you may just untune the antennas and get less range.
you could try to find a larger antenna for your car.