Lots of good advice. Thing is, each situation/location is different.
Where are your TV stations? This is a good site to find out:
https://tvfool.com/index.php?option=com_wrapper&Itemid=29 Put your address in, and it lists stations, frequencies, direction, and strength. Then you can pick a strategy. If they are close, almost any old antenna will do. If they are far and clustered, a directional antenna pointed in their general direction will work wonders. If they are far and spread all around, it's tougher. For that, a high, directional antenna on a rotator works best. Another "fire and forget" strategy for that situation is to vertically stack directional antennas (the spacing is important) and combine them with a splitter/combiner (it will cost signal, and there may not be enough without LNAs for each antenna).
Couple of rules of thumb:
Higher is (almost) always better than lower. When it's not, it's topography dependent (Fresnel zones, etc.)
Outside is (almost) always better than inside. When it's not, it's house or situation dependent.
Raising a given antenna may let you get away without using an LNA.
Conversely, adding an LNA to an antenna that's too low is unlikely (though not impossible) to improve the situation very much.
LNAs are best put at the antenna (you need to amplify the tiny signal before subjecting it to any loss). Also, put them before a splitter.
Good grounding is super-important to help LNAs live longer, especially outside. (Using a good quality LNA also helps, but there are very few on the market - nobody wants to pay a little more for a good design, and nobody wants to MAKE a good design since the non-Western world immediately rips it off, kills the quality, and undercuts the original manufacturer anyway.)
