Should be simple for you guys,
I'd need a schematics for building 2 input antenna coupler for TV antennas.

"Insufficient data". You need to be more precise about what you're
trying to accomplish.

I can think of at least five possible interpretations for "2 input
antenna coupler":

- A power divider, which allows two separate TVs or radios to be fed
from a single antenna, over that antenna's full frequency range
(a.k.a. a "splitter")

- A power combiner, which the signals from two identical (or similar)
antennas to be combined and fed to a single output (e.g. to allow
"stacking" of antennas for increased directional gain).

- A "duplexer", which allows the outputs of two dissimilar antennas,
which handle different frequency ranges (e.g. VHF and UHF) to be
fed down a single feedline.

- A "channel combiner", which allows the outputs of two (possibly
similar) antennas, pointed in different directions to pick up
different stations, to be combined without interference.
[Single-channel combiners are available commercially; more complex
combiners can be made but they aren't trivial.]

- An impedance matcher, which allows an antenna of one impedance to
be used with a feedline of another impedance (e.g. a balun which
goes from a 75-ohm coax to a 300-ohm twinlead-type antenna).

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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