Part list and ordering
It's recommended to use JLCPCB for ordering the PCB. The PCB design is completely open source (EasyEDA): https://oshwlab.com/maarnotto/lpl_esp32signalhacker .
To order from JLCPCB you can clone this project and then click "One-click order PCB/SMT":
Alternatively, you can find the project files in the "HARDWARE" folder, and upload them to JLCPCB.
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ESP32 DevKit (32-WROOM is what I bought) https://www.aliexpress.com/item/1005005564949759.html?spm=a2g0o.productlist.main.3.3a1f7404VXPdu3&algo_pvid=b0ce41a5-6670-4f95-b3eb-71153394459e&algo_exp_id=b0ce41a5-6670-4f95-b3eb-71153394459e-1&pdp_npi=3%40dis%21EUR%2114.48%216.8%21%21%2115.66%21%21%40212243c316903023381698401d0bfb%2112000033570006445%21sea%21PT%21888150602&curPageLogUid=xd20432naP3X
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RFM69HW (you can buy one or two for full duplex possibilities) https://www.aliexpress.com/item/1005001650910899.html?spm=a2g0o.productlist.main.3.56ec4417AYLkuB&algo_pvid=d93d763e-6b9a-4013-ac8e-63ddc8830550&algo_exp_id=d93d763e-6b9a-4013-ac8e-63ddc8830550-1&pdp_npi=3%40dis%21EUR%213.07%212.7%21%21%213.32%21%21%402102191b16903026338342497d0775%2112000016983564704%21sea%21PT%21888150602&curPageLogUid=4F8t8rPTdkpV
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OLED I2C display (be aware of the pin order on the PCB and the module you buy, they must be the same: VDD-GND-SCL-SDA) https://www.aliexpress.com/item/1005003484018034.html?spm=a2g0o.order_list.order_list_main.180.21ef1802hDTqoj
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SD Card module (again, be aware of the pin order) https://www.aliexpress.com/item/1005004916894706.html?spm=a2g0o.productlist.main.3.30ee17c4a7DWjT&algo_pvid=247a9d02-0738-466d-b46c-858e4add2c45&algo_exp_id=247a9d02-0738-466d-b46c-858e4add2c45-1&pdp_npi=3%40dis%21EUR%212.67%211.87%21%21%212.89%21%21%40211bc71916903020299232934d0777%2112000031008839838%21sea%21PT%21888150602&curPageLogUid=HUhhZQuvDB8G
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433 MHz antennas (or other frequency band, depending on the frequency band you want) https://www.aliexpress.com/item/1005005071324338.html?spm=a2g0o.order_list.order_list_main.190.30031802UlbYMB