TV Antenna - 4K HDTV TV Antenna Indoor with Signal Booster TV Antenna for Smart TV and All Older TV's

Q: 250 mile range on a small square, is that claim real, and has the range been tested?

: D Robert not only is your statement false because the Earth is approximately 26,000 miles around you are talking about approximately 1/100 of the circumference. Also depends on the height of the transmitting tower. Also depends on hills and valleys or mountains in each area. It is possible to get 250 miles with a straight line without anything in the way, trees or buildings or anything else.

Q: Can i get discovery channel and history channel?

Can't even get local channels with it.

Q: What is the Impedance or ohm ratings?

Impedance is resistance dealing alternating current signals in coils of wire and or capacitance (reactance) and ohms are a basic resistance rating. So it's hard to answer the question since it is a point of apples and oranges. Sorry I can't help more, but we need more info.

Q: Does it work well in a metal mobile home?

Yes. The cord that connects to the TV is long. I do have it near a window. You need the male head plug from an old cell phone charger to plug the doo dad from the antenna into the plug into an ac outlet. It doesn't come with one unfortunately. But if you have replaced you cell phone as many times as I have, you probably have a spare somewhere. The antenna strength is strong enough to penitrate cinder block walls.