We chose the standard COBRA omnidirectional antenna from many antenna options to achieve optimal signal strength for the COBRA system. You may use your own 2.4 GHz antenna with an SMA connector but make sure you perform proper signal testing to ensure there are no issues with your selection.
During our internal testing, we have found that the antenna provided offers the best performance to cost ratio and have found that a more expensive antenna provided marginal benefits over the provided COBRA antenna.