Just read this in the comments (https://news.ycombinator.com/item?id=39899534):

> I wonder how much polarization affects things; I was once told that terrestrial FM Radio is transmitted with vertical polarization to reduce interference from tall objects between you and the transmitter.

> Terrestrial TV (some of which used bands that overlap FM radio) uses horizontal polarization.

This is only true in the US (and probably areas influenced by US standards). In Europe, FM radio transmissions (and digital television nowadays) tend to be mixed-polarization (circular polarization), except if there are known interference (usually border areas) that would preclude mixed-polarization.

Analog television meanwhile significantly differs depending on your area, which required you to either test which tower and polarity is the best (note that all broadcasts are transmitted at a single tower, unlike in the US), or just... request a map with that data.