There seems to be a bit of confusion between Freeview and FreeSat.  In UK there is satellite TV (SKY) and Freeview.  For SKY you need a small dish and a receiver.  For Freeview, you need a set top box (or a TV with a built in tuner) and a normal antenna (either one sold as a digital antenna or an existing one turned through 90 deg).
Here, you can receive the Freesat channels (BBC, ITV and the like) either on a dish and a SKY box (no card required) or a generic receiver for example those that are on sale in Lidl or Aldi from time to time as a kit although the dishes (80cm) are a bit small for reliable reception here and at least 1m is better.
If you want the Spanish equivalent of Feeview (TDT) then you again either need a TDT tuner and a normal antenna or a TV with the tuner built in plus the antenna.
If it's the satellite receiver you need, I recently bought one in Hiper Europa in Amposta.  I bought the cheapest one they had in stock (not HD) for 58 euros.  It's Spanish built and to be honest, I'm not impressed with the quality of operation.  They also sell satellite receivers.
Whether or not I've got any of the above wrong, hopefully Nigel will jump in here to put me right.