Interested in what antennas people are using in their nodes. My personal interest would be antennas with some gain (low coverage area) that are reasonably vandal proof / water resistant but all contributions welcome.
In my ballooning experiments I have used the simple helical antenna, soldered directly onto the pcb. Works great, achieved a 360 km communication (at 6 to 12 km height…).
Google “junior iot challenge kaasfabriek” for info.
I tested more than six indoor antennas. I prefer the second one.
we continued here