Frequency shift keying antennas
Antennas don't just work for a single frequency and for nothing else. They typically work for a larger range of frequencies. We call the total amount of frequencies their bandwidth.

So although FSK uses a set of carrier frequencies, all of these are typically well-received by a single antenna.

Yes, bandwidth of antennas is limited, but so is the bandwidth of the signals you want to send over the air or can even generate and process.

"Radio Stations": you probably mean FM audio broadcasts? Those are FM, not FSK; the same applies, however: though FM uses a whole bandwidth to transport a single programme, an antenna can easily pick up this whole bandwidth. In fact, normal "FM Radio" antennas capture the whole ca. 87 MHz – 108 MHz bandwidth reasonably well at all. 

You seem pretty confused by a set of basic terms. I don't really know your background, but getting a clear introduction to what a signal, frequencies, bandwidth, and radio are might be a good idea before getting into concepts like FSK. In fact, I'm pretty confused by the fact that you already asked about LDPCs and now about these basic terms of radio transmission – I'd typically expect people to learn about what an antenna does and how that works with signal bandwidths a solid year before they can get to learn about LDPCs – which demands good understanding of what a radio channel is. So my intuition is that you're from a math or computer science background, and it came easier to you to understand algebraic coders than  RF channels (which would explain why you didn't immediately understand, though you showed great insight there, that deletion channels aren't that often used to model wireless communication).

Now, aside from getting a nice textbook (or the ARRL handbook, for a start) that explains a bit of RF technology basis, it might be a good idea for future questions to explain a bit of the background you have. I'm really puzzled by the "order" of your questions!