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It's hard (nearly impossible) to do that on the pcb, because of the wavelength. The best receiver performance you will have with a antenne with the length of lambda/2 or lambda/4. For your case a example: 88MHz = lambda/2 ~ 1.7m :-?
Many manufactors of RF IC's have some application notes with good background descriptions. As example www.RFM.com ... and many other also ... :wink:
Yes, you can use headphone's wire as a primitive antenna. Connection into receiver is made trough a small capacitor (~10-100pF) which has small resistance for HF and don't give the pass for audio. Antenna is made from wire's shielding. It's better than no antenna..
Better is to use lambda/4 wire antenna electrically extended by coil if you want to have it "small"