This video shows the various Impinj antennas in action reading near-field and far-field RFID tags. Antennas demonstrated include:

•   MatchBox 
•   Mini-Guardrail 
•   Brickyard 
•   Threshold 

This video also shows a demonstration of the Impinj Speedway xPortal reader, the smallest form-factor and highest performing full-feature portal on the market. The Speedway xPortal reader features Impinj's patented dual-linear phased array (DLPA) antenna which delivers the power and read-range of a linear antenna with the ability to read tags in any orientation (like a circular-polarized antenna).