This is an almost all !
VHF tuners had 75 ohm inputs. then a balun mounted on
the tuner & off to the term board at 300 ohms. Coax was a rarity in the
olden days for a down lead. You could have 2 matching
transformers & the balun all giving losses. So in the mid
70's coax VHF inputs became common usually with a 300 ohm
input that could be switched in for ears etc.
UHF tuners had 300 ohm inputs. They kept that for good reason.
If you compare RG59 with quality foam 300 ohm at UHF
freqs the loss of coax is much higher. So in a fringe UHF area
you could need an amp for UHF using coax.
Other way is to run separate antennas with coax for VHF & 300 ohm for UHF. Remember every time you add something EVEN a
connector there are losses especially at higher freqs !
Some combo antennas could run separate outputs also. Dont
remember but probably Wineguard & maybe Jerrold (GI), they were
the premier antennas then.
73 Zeno
