500$

https://wiki.banana-pi.org/Banana_Pi_BPI-M4 60$
pelican 1060 41$

GL.iNet GL-MT300N-V2(Mango) 30$ [seems an earlier version]
TP-Link AC750 Wireless Portable Nano Travel Router(TL-WR902AC) 40$ [current version]

INIU Portable Charger, 22.5W 20000mAh USB C in & Out Power Bank Fast Charging, PD 3.0+QC 4.0 LED 33$
AAOTOKK 3 Ft 90 Degree Micro USB Cable Right Angle USB 2.0 Micro Male Nylon-Braided Fast Sync  8$
ip rated front data connector [ethernet]
ip rated front data connector [usb]
sma out [antenna]

loaded with:
FTS / Taky / Tak Server free
ATAK Maps + Plugins free
Video Restreamer free
Web Console
Zerotier

Ubuntu Server 20

changes for better product:

Banana Pi M5 BPI-M5 S905X3 Quad Core Cortex-A55 4GB RAM 16GB eMMC

Anker Portable Charger, 325 Power Bank (PowerCore Essential 20K) 20000mAh Battery Pack 50$
GL.iNet GL-SFT1200 (Opal) Secure Travel WiFi Router 40$

ddwrt openwrt or tomatoe for travel router [vet daily builds]

restreamer vs obs

wifi will be extremely easy to fox hunt. https://en.wikipedia.org/wiki/Transmitter_hunting