[Hybrid tellies]

I don't think there are many or any local AM radio stations available to you in Finland or anywhere in Scandinavia. But if you are interested in long distance or DX AM reception then an outdoor aerial mounted high or away from the house to reduce the interference and noise generated by almost every household gadget. Also using a loop aerial rather than a wire aerial offers more immunity to local electronic noise.

For FM as has been mentioned before investing in a VHF band 2 aerial use a small portable radio in different locations to see what signals are available to you. If these are coming from different directions maybe a vertical dipole rod aerial mounted on the roof is the way to go. You could feed this to a decent low noise distribution amp to feed various radios around the house.