Transponder troubles

Ive started racing my G2R at an indoor track near me. The only problem is I cannot get their transponders to work on my truck.
I have fitted it in various places on the shell but with no success
The Geezer in race control recons that its because my truck gives off too much interference :eek: I'm not sure I believe that myself, but even so there must be a real reason.
where do you guys that race fit yours, any help would be greatly received :027: