The 6100 will have a reliable range of under 500 ft. Check out this full thread and investigation below... this was actually on page 2 of this very forum so not hard to find:
http://www.rcuniverse.com/forum/m_6555830/tm.htm
I've totalled a plane once already due to this limitation, and read the official email I posted from Horizon regarding the range. : ) Don't toast your bird, spend the extra $30 and get the AR6200 for this application.
- K