adding remote start soon

well, folks i plan to add remote start to the phantom (20012 liftback) i actually had it on my 2010 and liked it a lot. the only complaint i had was the distance of using the remote start. it was pretty limited. i wonder if the distance can be improved. i heard a rumor that you could add length to the antenna of the start.
btw price is about $500. even if i got a discounted module installation is around $100. thanks for your feedback and ideas