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The BroadcastVision is Part 15 compliant, which means that the signal won’t be getting into the aviation bands (unless it’s been modified).
Your analysis of the range of Part 15 FM is accurate as far as it goes. But don’t forget that a field strength of 4uv doesn’t mean that a signal of strength 4uv will be getting into your radio. I believe there were some posts earlier which talked about how to calculate the signal strength given the field strength. It appeared, for a rough rule of thumb, to be about 1/2 the field strength. So that 4uv field strength means about 2uv signal strength, which is close to the sensitivity limits of a good car receiver with a reasonable level of quieting (some may go down to 1.5 uv with some quieting). So that 600 to 800 foot range for a good receiver, and line of sight to the antenna, is probably pretty accurate. I would imagine that a better car antenna would make some positive difference as well (that measurement assumes a 1 meter rod type antenna).