RE: transission to 2.4 Ghz
There are many fliers in the same situation. The easiest long lasting solution seems to be to get one of the new transmitters that can accept an RF module for either 72 or 2.4. Then for the cost of a module you can fly your old recevers as long as you want and get into the 2.4 game at any tme for the cost of a module and as many new receivers as you can afford