Very newbie here. How would one measure power using a calibrated attenuator... I to and looking for a SWR meter but am seeing that the NanoVNA might work and then some, but I dont want to miss out on features that are on a SWR (reflected power, power output) that I might need, or do I need them? I have an HT BF-F8HP that will be connected to a car roof mount antenna (might be either Comet CA-2X4SRNMO or Browning BR-450 UHF).