On Tuesday, November 26, 2019 at 4:23:43 PM UTC-5, wrote:

My comment was based on my frustration in that I can buy a Scout adsb-in receiver for $200, but have no sunlight-readable display to use with it. My iphone is not bright enough. The nice bright traffic displays only accept flarm-format data.

Some misunderstandings are expressed in your comment. See the Powerflarm web page:

Transponder and ADS-B Receiver

While many aircraft are already FLARM-equipped, there are still some that are not. With the optional transponder and ADS-B 1090ES receiver, available in select PowerFLARM devices, you are protected from those aircraft as well.. The additional receiver listens for intruders transmitting Mode-C, Mode-S, and ADS-B messages on 1090 MHz, and includes those aircraft in the smart trajectory prediction and collision warning algorithms.

https://flarm.com/products/powerflarm/

And recently mentioned in another RAS thread is ongoing work to bring TIS-B and ADS-R to Powerflarm and that will improve ADS-B capabilities.