In addition, most homes are now wired for
cable, which is much better shielded than your basic HF antenna.

not true. My radio scanner proves that the cable companies are not shielded.

Even when driving to the next county over, which is a different cable company,
I still pick up the cable tv transmissions on my scanner, through the air.

And even driving to the next city over, which is a third cable company, I still
pick up the transmissions through the air.

NOne of them are shielded.

It ruins trying to listen to the communications bands on a bunch of frequencies
above 30 MHZ.

Reporting it doesn't do any good, as all of the cable companies refuse to fix
it.