TV Antenna???

To clarify a little.. The converter box required is only a HD frequency tuner.
Analog signals were on numbers like 4. HD is transmitted on UHF via numbers like 4.1, 4.2 4.3 that your analog tv tuner couldn't dial in.
I hope this post separated the need for a tuner converter box from the need of a different antenna.
Now would anyone care to state why all our terrestrial microwave was changed to UHF and why it was a government mandate which meant the government would subsidize the cost of the converters ( which were mostly made in China ) ?