52 Week Ham Radio Challenge 2025 - Week 15: Monitor a transmission and take notes of the field strength

Monitor a transmission and take notes of the field strength
Monitor a beacon or transmitter that's transmitting continuously, such as the DWD RTTY transmission on 10100.8 kHz, and take notes of the field strength over the course of a week. What did you notice? Did it behave the same on all days or were there differences?