When sourcing, you must prioritize the Frequency Range (MHz) to ensure compatibility with target networks (e.g., 698-2700MHz for 4G/LTE or 600-6000MHz for 5G). The Gain (dBi) is crucial; higher gain (e.g., 9-12 dBi) provides better signal reach but may narrow the vertical beamwidth. Additionally, check the Voltage Standing Wave Ratio (VSWR), which should ideally be ≤1.5 to minimize signal reflection and power loss. For MIMO systems, verify the Isolation parameters to ensure multiple data streams do not interfere with each other.