My input after spending time reading the law is that maybe we should be focusing more on "receiving" notice. I think one could argue that the detailed specifications for signs and written notice in the law were put there to emphasize that you have to "receive" the proper notice before you are trespassing.
In a criminal case the prosecution generally must prove the elements of the crime "beyond a reasonable doubt". So in the case of improperly worded signs, or signs that are too small, or not in Spanish...one is tempted to argue (successfully in my view) that the definition of "notice" was not established. I think a better argument, would be... "prove (beyond a reasonable doubt) that the defendant RECEIVED notice...". If the sign is too small, or wrongly worded, or posted somewhere where you probably didn't see it, I think it would be very difficult to prove that you received the notice.
To paraphrase the late Johnnie Cochrane... "If the sign doesn't fit (too small), you must acquit..."
CONCEALED HANDGUN. (a) A license holder commits an offense if
the license holder:
(1) carries a handgun under the authority of Subchapter H, Chapter
411, Government Code, on property of another without effective
consent; and
(2) received notice that:
...
