need help with my RF toy car project

[BUGWEE]

We meet some problems when transferring data from transmitter to receiver over a long range . What would be the best RF could we use??
We also meet a problem while transferring data from transmitter to receiver if there is another RF exist? What should we do??

Thank you for your kindness in advance!

 

[joelumuna]

may be your receiver reach beyond the maximum range, that's why your receiver is not functioning properly