**broken link removed****broken link removed**
My estimate of your inductance depends on the dimensions of your coil. My paper towel roll is 38 mm diameter. Assuming you wound your coil with an overall length of 75mm, your inductance would be 154uH. If you coil length is 150mm then inductance is 86uH. So, I'm not sure how you arrived at only 11 uH. Please explain.
With your variable cap, let's estimate the tuning range. It depends a lot on the impedance of your antenna wire, and the capacitance of the diode+op amp load. However, we'll estimate the ball park boundary with the 86uH coil to be 1Mhz to 5Mhz. That's ok for starters but you'll have to tune things empirically to account for the other factors.
If you make your coil large enough, you don't need an antenna if just receiving AM broadcast up to 1.7MHz. Large enough = diameter anywhere from 20mm to 1000mm and coil length of 20 mm (ie. the wires overlap each other).
The op amp is not biased correctly. You can correct this with two different methods: 1) disconnect pin 4 from ground and attach it instead to -9V or 2) disconnect pin 3 from ground and then attach two 100K ohm resistors to pin 3. Attach the other end of one of the resistors to +9V and attach the other end of the other resistor to ground.
You should not use a normal 8ohm speaker in this circuit. The op amp cannot drive enough current to power the speaker. You can use a crystal earphone as the application circuit shows, or you can attach another amplifier after this one to interface to a speaker.
I recommend that you tune the input to receive local AM broadcast signals first because they are much stronger than most shortwave signals and so will be easier to find.
Edit: Audioguru notes something in the next post that is very important also. You must have some sort of DC load on the right side of the diode for the detector to work. Here is an explanation of how the diode (or envelope) detector works:
https://www.st-andrews.ac.uk/~www_pa/Scots_Guide/RadCom/part9/page2.html
so you must add a resistor and capacitor to ground on the right side of the diode. The resistor should probably be about 22K ohms and the capacitor is a small value, like 470 pF