Can I substitute antennas? For example can I use another dipole antenna instead of the exact model a module was certified with?

Yes, this is possible if: 1) The peak gain of the alternate antenna is less than or equal to the original antenna, and 2) The antennas are the same type. There are some cases that are not black and white. It is the customer's responsibility to collect and retain the appropriate and accurate test data traceable to NIST standards for the alternate antenna. Please contact LSR to discuss any questions.