One step common to the Sid receivers is that they will be tuned by selecting capacitors to adjust the resonance of the antenna. The Simple Sid instructions describe a way to do this. Here is my take:
Here you add in the caps with the dip-switches. The advantage here is that once you find the setting you want, you can take those exact capacitors and solder them into your circuit. Handy since there is quite a variation between caps of the same nominal value.