Antenna for AM60-550

[Thibault]

Hi all, I just got a Blender Tongue Am60-550 to feed my vintage TVs to which I connected a small and simple fm antenna.

I am very, very new to rf and the first things I noticed are: I can’t seem to get vhf to work (that’s ok, I ended up using UHF channels instead) but more importantly my vintage tv will barely get any signal if I am further than 20ft (snowy picture and no sound).

Would anyone have any recommendations for a good vhf/uhf antenna?