Hi Daniel

Generally a mixer in radio terms is a device where two frequencies are
input and the sum or difference of them is the output. So you are
talking about a combiner..

I think you'll have some trouble with your intentions.

It is relatively easy to combine the signals from two antennas and then
split them into two receiving devices. (The antenna combiner might be
the same as the splitter only connected the opposite way. Its usually a
passive device so will work equally well in both directions)

The problem is that since the bands of use are similar you cant stop
(say) the FM omni receiving some signal from the TV band transmission
appearing at the input to the TV. This will most likely cause ghosting
or other degradation.

I suspect that you mean unidirectional VHF/UHF antenna rather than an
omni. Using an omni is very likely to also create TV ghosting.

You could conceivably notch the output of the omni to not pass TV
signals but by now the project is getting kind of expensive.

I suggest you just use the one TV unidirectional antenna and have a
single splitter inside the house connected to the FM radio and TV. You
may get sufficient FM signal for your needs.

You are looking to buy a TV splitter to run two TV's in the house. Shd
be pretty cheap.

Cheers Bob VK2YQA

Daniel wrote:
I am contemplating on combining the signals from two antennas onto one
cable using some sort of an "RF combiner" (is this the right term? Is
"RF mixer" a better term?).

The idea is that I combine the signal from a dedicated omnidirectional
FM antenna and a dedicated omnidirectional VFH/UFH antenna, since I
have only one cable run in the house and I want to use it for both FM
and TV reception.

Does this idea make sense at all?

If so, what's the market name of this "RF combiner" device I should be
shopping for? Can you recommend a specific one? (does Radio-Shack have
such?)

Thanks,
Daniel