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Some advantages are:

  1. As the frequency increases, the so does the data transfer speeds.
  2. The gain and directivity of the transmission antenna will increase for the the same size.
  3. Although signals experience more attenuation at high frequency, this could be advantageous for covert purposes.
Ultimately, each band has certain limitations, depending on what the FCC has them dedicated for. So higher frequency could be great, but could be power limited.
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