Apologies for the slow response, but this extract from Spain Travel Health suggests that unvaccinated travellers to Spain can travel with either a negative Antigen or PCR test:
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"- If the document proves a diagnostic test: date of sampling, identification and contact details of the centre performing the analysis, technique used and negative result.
Nucleic acid amplification tests (NAAT), which detect the genetic material of the virus (e.g. PCR, TMA, LAMP, NEAR etc.), carried out within 72 hours prior to arrival in Spain.
Rapid antigen detection tests (RAT), which detect the presence of virus antigens, carried out within 48 hours prior to arrival in Spain. The accepted tests are those approved by the European Commission, which can be found in the following link."
https://www.spth.gob.es/info-pcrIf I'm reading your update correcting, it suggests the test has to be a PCR? Can you post the source for that info please? There's so much confusion around the recent changes, it would be good to see it in writing.
Many thanks and kind regards,
Kim