Glad to hear some camp grounds are now finally changing over to high def TV signals.
I am surprised the installed digital TV converter for the OTA would not work for you. It should be already installed at the input cable of each TV SET to get signals from both OTA and CABLE. We have never used one of those digital tv converter boxes...
Since we have HDTV ready TV sets we have to always scan for analog and digital TV signals everytime we hookup at the different cable TV places... Also the TV SET has to be set for ANTENNA when using the OTA signals and set for CABLE when using the cable TV signals.
If it were me I would start replacing my old TVs for the new HDTV units. You will be then utilizing the full high definition experience.
Currently when using the digital TV adapters the received HDTV signals are converter back to "ugh" analog signals so that you can view on your old analog TV unit. Depending what you purchase a 22-inch LCD HDTV VIZIO from WALMART will cost less than $200. These new TV's draw less power and will be less weight and will work on both ANALOG and HIGH DEF modes TV signals.
We threw out all of our old analog TV sets in the landfill a few years ago when the TV systems all changed to digital mode.
We purchased 120VAC type HDTV units and when we need to use them when off the power grid we use a 600WATT PURE SIGN WAVE Inverter setup just for the home entertainment equipment and other small wattage 120VAC appliances we want to use. If you just want to use the HDTV setup you could only use a 300WATT PSW type Inverter. Getting 12VDC HDTV replacements will be more expensive and are harder to locate. Everything running from 120VAC has not been a problem for us.
Roy Ken