I have just discovered this: I have found that diplexing antenna in IS working with AT9. I read elsewhere that it did not, installer also said "sometimes it does and sometimes it doesn't" because of the new sat. AH HAH! Maybe this si why my local sat is real low. he said the ka freq occupies same as OTA antenna. So atleast WHEN I go to the HR10-250, i can keep that monster up there. I do have a good signal on reg sats. So diplexing is "possible" but at the expense of sat strength of locals.