Thank you, G4BCH
Not the ones on a transmitting tower, truly made and meant to present whatever (50Ohm?) impedance
at the single transmitting frequency to match a transmission line and TX
- Plain RX ones, of any type, dipole, yagi, omni, folded, bowtie, loop, rabbit, log periodic, parabolic, your choice...
They connect usually to 75 Ohm cable, to a 75 Ohm plug to a 75 Ohm jack to the tuner module.
All this 75 Ohm concert tells that at some frequency, the antenna sources a 75 Ohm impedance signal... At what frequency ? Impedance is tightly linked and in function of frequency.
But never published, never exposed, never analyzed in decades of TV antennas being 'engineered' and sold. For consumer or not; there has to be a mathematical/scientific rationale making sense to feed a TV tuner properly *. Can find
nothing. Like using a coathanger instead of the fancy pricey 'cutting edge antenna' is the same, nothing is rational science. As you mean, products of a marketing dream with all the empirical signatures.
* Which is another subject I tried to explore before in another thread a long ago. TV tuners with a 75 Ohm input jack and NO published impedance vs. frequency plot, working at large frequency spans. Where in the span are they 75 Ohm ?
The point is, how much of a farse/fraud are TV antennas supposed to work on several hundred MHz span with a nobody-knows (nor cares) its impedance and electrical matching behavior.
If front end TV tuners with very high impedance fets are the norm now; what is this "75 Ohm" for ?