American radios are designed to receive radio waves on the AM and FM bands. The AM band in the United States ranges from 535 to 1705 kHz, while the FM band ranges from 88 to 108 MHz. In Spain, the AM band ranges from 526.5 to 1602 kHz, while the FM band ranges from 87.5 to 108 MHz. This means that an American radio will be able to receive Spanish radio stations on the FM band, but it may not be able to receive all of the stations on the AM band.
In addition, the power of radio transmitters in Spain is typically lower than in the United States. This means that an American radio may not be able to receive Spanish radio stations as well as it can receive American radio stations.
Finally, some American radios may not be able to receive the RDS (Radio Data System) signals that are used by Spanish radio stations to transmit information such as the station name and song title. This means that an American radio may not be able to display this information on its display.
Overall, an American radio will be able to work in Spain, but it may not work as well as it does in the United States.