Does this mean I can receive all channels digitally for free?
I think you still have to pay "abonament rtv" ;)
Do I need to subscribe somewhere?
As far as I know you don't.
I have a TV with a build in DVB-T tuner; will this work, or do I need a separate decoder with smarcard?
Just tune in and check out. UHF channel 37, freq 602,00 MHz, antenna polarity H, MPEG-4. Be aware that is emitel.pl/strona-glowna/dvbt-krakowkrzemionki-k37.jpg (low power transmitter).
radiopolska.pl/wykaz/pokazdv_stacja.php?pid=70 - DVB-T Krakow
low power transmitter
From 6th March 2009 DVB-T Krakow increase transmitter power to 15 kW ERP.