Hello guys, can external and weather condition affect SWR ? I assume yes, but could someone explain how ? I have EFHW wire antenna ca 24m long. It is placed in not very good condition, just ca 5 -7m above the ground one side is "shielded" by metal-concrete building (one end) and also by a slope on the second end. It is located in the city center. I use Xieugu G90 and its internal tuner. I have CM choke on the feed line and I use our central heating as ground (2nd floor appartment building). The antenna was hanged mid of DEC 2020 and I was surpised I had really good SWR on 20m band 1.1-1.2. Within ca mid of JAN till I would say mid of FEB the SWR was ca 1.5 and within MAR it was at about 2.0. But since yesterday the SWR back on 1.0 on 20m and 1,1 on e.g. 15m. There were no changes done by my antenna system. Is this external condition what affected my SWR ? I would to understand it just a bit. Thanks for any replies.