I have cable from the house to the barn but nothing to the shop as mentioned above. My signal from my current setup is okay in the garage but out on the back patio between the garage and barn the signal fades. I'm thinking a repeater in the garage would improve signal on the patio.
I've considered a wired outdoor range extender from the barn router to the end of the barn closest to the shop thinking this might improve signal and pierce the shop walls where i could add another repeater.
I suppose something like this might help the current system and it's not very expensive.
https://www.amazon.com/TP-Link-EAP110-Outdoor-V3-Installation-Controller/dp/B07CG3YRTR/ref=pd_di_sccai_cn_sccl_3_3/134-9076112-4019749?pd_rd_w=pJT3E&pf_rd_p=1ed8df3a-0df8-4988-98b9-252e4c99c568&pf_rd_r=HXQ42JEKBJYMK1APXH96&pd_rd_r=e6839a53-619c-4ed2-9190-10d503a32502&pd_rd_wg=ns0Vd&pd_rd_i=B07CG3YRTR&psc=1
I considered a directional yagi on the end of the barn pointed at the shop with a repeater in the shop. None of this would cost much to add.