![propagation - What is the cause of this unusually long period of terrible HF band conditions? - Amateur Radio Stack Exchange propagation - What is the cause of this unusually long period of terrible HF band conditions? - Amateur Radio Stack Exchange](https://i.stack.imgur.com/5cLBl.png)
propagation - What is the cause of this unusually long period of terrible HF band conditions? - Amateur Radio Stack Exchange
![hf - Why does the HamQSL website say the 40m band is fair and the 20m band is poor during the day? - Amateur Radio Stack Exchange hf - Why does the HamQSL website say the 40m band is fair and the 20m band is poor during the day? - Amateur Radio Stack Exchange](https://i.stack.imgur.com/MVRtx.png)
hf - Why does the HamQSL website say the 40m band is fair and the 20m band is poor during the day? - Amateur Radio Stack Exchange
![Operating notes: Better band conditions, AC2YD working the world with QRP, 9A/W4GAL rocks a 4-element 40-meter Yagi - KB6NU's Ham Radio Blog Operating notes: Better band conditions, AC2YD working the world with QRP, 9A/W4GAL rocks a 4-element 40-meter Yagi - KB6NU's Ham Radio Blog](https://www.kb6nu.com/wp-content/uploads/2020/09/ac2yd-qsl-front.jpeg)
Operating notes: Better band conditions, AC2YD working the world with QRP, 9A/W4GAL rocks a 4-element 40-meter Yagi - KB6NU's Ham Radio Blog
Median (±25 th and 75 th percentiles) octave band sound pressure level... | Download Scientific Diagram
![Operating notes: Better band conditions, AC2YD working the world with QRP, 9A/W4GAL rocks a 4-element 40-meter Yagi - KB6NU's Ham Radio Blog Operating notes: Better band conditions, AC2YD working the world with QRP, 9A/W4GAL rocks a 4-element 40-meter Yagi - KB6NU's Ham Radio Blog](https://www.kb6nu.com/wp-content/uploads/2020/09/ac2yd-qsl-back.jpeg)