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Antenna projects that are on the internet are --> antenna projects that are on the internet.

Antenna projects are Experimental.

Antenna projects are for to learn something.

The 4 bay bow tie design antenna is a standard production type antenna for a long time now.

There are no antenna projects that I know of that are , "super secret classified designs" that will out preform , standard production antennas.

And there is no one antenna design that is good for all reception situations.

Yes a antenna can be designed to receive better at specific frequencies.
They are known as , cut to channel antennas , and are are available as standard production antennas.

For 99.5% of reception situation situations , standard production model antennas are all that is required or needed for reliable reception.

And here is a Truth.

There is no such antenna as a HD antenna.

HD Antennas were invented in Marketing Departments as a way to sell more antennas.