Some VHF Comm's have a built-in SWR (Standing Wave Ratio) display. It's not rare to see them, but three on one aircraft is not the norm.
You can select forward and reflective power ( in this case "watts"). You're looking for strong output (forward) and little to none reflective. High reflective power is indicative of a bad or failing antenna, co-ax or connector.
All three of these checked good.
