We develop and test our antennas in Bavaria, where a hard winter is a few days below zero. So for the question of how the IceConeFeed handles a real Nordic winter, we asked the operators who run it there. Here is what they report. A note on what the IceConeFeed is, since it matters here:…

How a 10-turn L-Band H1 helix detects the 21 cm hydrogen line from a city balcony in Jena — VNA data, full signal chain and reproducible galaxy transits.