Antenae length??

[notnodak]

I purchased a Losi DSM out of a Mini Slider to put in my Brushless Maxx to hopefully fix the range/glitching problem. When I recieved it today I noticed the antenae is only about 3" long from case to end. If I put this in my reciever box(3905Maxx) it'll stick out maybe an inch. Can I just add to it so I can get to the antenae tube and just make it long enough to stay under the body or won't it matter? I'll test it tomorrow to see but I don't like surprises