I've seen very few. Of the ones I've seen, Trump's leading, maybe two or three to one. I live in liberal Illinois, but in a deplorably rural area. And all the signs are those small ones, not much bigger than an 8.5 x 11 sheet, so (as you say) nobody's shouting to the heavens about their choice.

There's one Trump supporter a few blocks from my house who, four years ago, put an empty chair in his yard, with a copy of the Presidential shield affixed so his meaning wouldn't be lost. I had SO yearned to put a binder in that chair--the cover of which would have read "Mitt's Chicks"--but alas, it would have required taking a few steps onto the chair-owner's property and nobody seems to be able to find the humor in trespass anymore...