Most of the antennas that ship with evaluation boards are not very good. One option for an upgrade if you’re using the recommended 868 MHz network is the Taoglas TI.08.A. IMPORTANT: Never turn on a LoRa device without an antenna attached! The power sent to the antenna can destroy the device if there is no antenna attached to radiate it.

"When their antennae become clogged with pollution particles, insects struggle to smell food, a mate, or a place to lay their eggs, and it follows that their populations will decline,"