Remote controller transmitter giving us a hard time

our remote controller (the box with the antenna) keeps not picking up the signal. is there something we are doing wrong or do we need to somehow make the signal stronger. if so can someone tell me how to make the signal stronger?

vivek.

thanks in advance.
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oh we tested it in a room and it ran fine sometimes but other times it didnt move and we had to jiggle the transmitter and move it about to get it to work. the mentor suggested it was just interference but i really dont want this to happen during hte competetion.

See here: