The board comes with two 2.4GHz antennas and one 433MHz antenna. The shorter right angle antenna is 433MHz and should ONLY be used on the CC1101 Antenna connector on the board, labeled "CC1101_RF". The taller antennas are 2.4GHz and should ONLY be used on the ESP32 and NRF24 antenna connectors, labeled "ESP32_RF" and "NRF24_RF". Using the wrong antenna could damage the modules.