Novice, need help on SW

Hi, I am so glad that I found this board which has such a caliber in Ham's technical experts .

I have tried to read FCC specs and could not make any head or tail. I have some questions and I hope you folks can help me out, or point me to a right direction. Thanks in advance.

1. Is there a such thing that would transmit FM in freq bands less than 20MHz?

2. What do people usualy transmit in 4Mhz. 7Mhz and 10Mhz bands? Should it be mostly AM? or any other modulation scheme?

3. In such a narrow band likes the 7-7.3MHz band, how much ernegy would be allow to leak outside the band? And how much a leak will cause the FCC to knock on the door? Did they ever knock on anybody
door, or is it only a honor system?

Regards,

HiTi