ESPNow range testing
Now that RSSI capability is in the V1.18 ESP32 images at: https://github.com/glenn20/micropython-espnow-images/tree/main/20220408_espnow-g20-rssi-v1.18-6-g24cf16719 here are some sender and receiver examples.
After you get these units running you will need to change the MAC addresses in both units.
Although the ESP WiFi chip seems robust I would suggest that the unit you are changing antennas on is powered-down.