Try a Pi Zero W (Not the latest Zero 2 as that has a quad core), I’ve been running one for over 4 years now with no problems.
Current temperature 43c with ambient 17c – just an indoor antenna sitting on a tin can by a NW facing window around 14 miles from Heathrow. During busy times up to 30 aircraft shown on the map.
Actually have 3 zeros, one runs 24/7. Another is a portable unit set for wifi roaming and mobile tethering and the third is just used for experimenting with images and ADS-B accessories.
Seem to be in short supply at the moment but a third the cost of a Pi 3B or 2GB Pi 4
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