Always helps to ensure you resonant the antenna for maximum performance and noise filtering. Here's the system presently used to monitor LES-5 https://twitter.com/coastal804... Here's the dimensions for a tuned 237MHz Yagi using the wa5vjb 'cheap' yagi design: https://twitter.com/coastal804...

It's entirely solar powered. Except for a 5 year timer powered by a battery that was suppose to turn it off. I guess that didn't work so well. See page 43, https://apps.dtic.mil/dtic/tr/... Scott Tilley