Depending on where you are, you might never get that.

If you're anywhere within ~150km of an airport with radar, you will likely get hits on certain days (due to atmospheric lensing).

Not just any airport but only airports with TDWR.

(There are none on the west coast: https://commons.m.wikimedia.org/wiki/File:Map_TDWR.svg)

And then more rarely, certain military airports.

I’m in Chicago under an approach path to O’Hare, and Midway airport is within that range as well.