Noob questions

[spic0m]

Hi all,

Sorry if this is irrelevant but somewhere i have to ask.
I have a pvr-150 and antenna as input, when running channel scaner in myth i get as results some "numbered channels" (channel 21-22-etc) and some alphanumeric ones (E11-SR12 and more like that). The numbered ones i can watch and are our national channels, the other ones anyone knows what is and how i can watch them? Going up/down channels with the remote i get only the numbered ones.

Thanks for any help.