Also I'll leave here our website if you want to take a look at the full project. Feel free to reach out, happy to help!
fwcubelabs.radiogalena.es

Hello Marc! Actually we're using QRP (10W max) diplexers for these antennas. They are mainly thought to portable ops so power shouldn't be a priority. We focused on reaching the best performance possible. Here is the response on the VNA.
Hope you find it helpfull!