I found some data on antennas that had been tested for a specific radio. I'm trying to decipher what this data means and how one would go about gathering it. Are there any good resource for learning how to read and understand this data?
Specifically, please explain the following metrics:
- The relationship between dBm (the power ratio in decibels (dB) of the measured power referenced to one milliwatt (mW)) and antenna length.
For instance, in the following chart, which group of antennas operates optimally: the one in the blue freehand circle, those in the red freehand circle, or neither?
What common methods/software exist for obtaining this kind of data?