a) Which antenna would perform better -- the Latona SR4C033-R or Grandis SR42I010-R? The Grandis is smaller, but which one has better performance?
b) For optimum antenna performance, what is the recommended minimum size of ground plane (your eval boards are 11.5cm x 3.5cm = 40.25 sq cm or ~6.2 sq in)?
c) Why are the matching circuits for the 2 antennas (in their data sheets) different circuits and not just different component values?
d) The form factor of the application requires the asset tracker to have a small antenna and height above the PCB is limited. We would like the LoRa range to be at least 3 miles. Are the two antennas above suitable for this application or should we be looking at something else?