How to build a magnetic loop antenna for HF reception?

[debojitacharjee]

I need to build a magnetic loop antenna to receive HF bands from 3 MHz to 30 MHz. Please tell me how to calculate and design it?

Is it also possible to use a mag loop to receive MF bands?

 

[AK9R]

Have you Googled "DIY magnetic loop antenna"?

 

[debojitacharjee]

Have you Googled "DIY magnetic loop antenna"?

Yes, I did but looking for the formula instead of a calculator. I need to know how to calculate the bandwidth of a mag loop.