Raspberry screen

Some documentation

https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi/easy-install

If you want to use freqshow, for the moment its for 3.5 inch touchscreen only

https://github.com/adafruit/FreqShow

Freqshow is a low cost version but receive only of hackrf + portapack