I have noticed that I have decreased range in two directions on the ADS-B receiver.
Because the colours represent the ranges at different altitudes I’ve got a version with just one colour.
This one shows a clear restriction in range in the NW and SE direction as marked by the red line. I do not know what is causing this but I have an observation to make. I live in a row of terraced houses and the direction of the road matches the constriction direction. While the aerial is in the loft there is extra “stuff” in the way in these directions because of the houses next to me.
I’m pretty sure this matches up. There is definitely a correlation. Whether that means there’s causation I don’t know but it seems reasonable. I might write a communication about altitudes and the natural obstructions around me [I’m looking forward to the maths involved].