What did a setup like that cost you if you don't mind my asking.
APC 1500VA UPS for the streaming computer -$50 on Craigslist
APC 1000VA UPS for the radios -$20, was discarded by a business. Was just "playing dead" and needed new batteries.
TrippLite 1000VA UPS for the router and cable modem (shared with VoIP hardware) -$100 @ Costco or
Sams Club. The only piece of hardware that was actually purchased new.
1800 watt true sine wave inverter with a large marine battery. -Inverter was given to me by my employer. They were stripping out a van they had purchased. In a previous life, the van was used by a local cable TV provider. They had no need for it and it was just taking up room where they wanted to put a storage rack in the van.
Honda eu2000i generator. -$400 on Craigslist. This one looks like it has been used extensively (read- old and beaten), but with the low oil shutoff and such a durable engine, they are pretty much indestructible. It still starts on the first or second pull, and the power is exceptionally stable since it has an inverter output. Highly recommended if you can find one for a reasonable price.
Of course, as I found out...unless you have a BGAN terminal and very deep pockets, you are still at the mercy of your ISP, no matter how many on site redundant backups you have.