IIRC both use a unidirectional antenna, but the antennas are different.
On 549, Slovenia disturbed in western Europe, so 1143 was better there.
On the Swedish and Finnish SDR, 549 was excellent and stronger than 1143.
It is the normal programming of Radio Rossi (but it seems they have some regional transmissions that differ).
Mostly it is talk and news, in the evening sometimes music.