If you really want to see AM IBOC's destruction and are located anywhere within a 4-5 mile radius of KPRC Xmitter, then head on over to KRTX 980 AM to see the damage it causes. On Both vehicles I have driven to Houston on, I have had bad interference from IBOC. I haven't driven through that area lately, but I am shure the splatter is still there in the Northeast part of town.
On the FM side, almost anywhere inside the 610 loop, KJOJ-FM is killed by KLTN's IBOC. I remember I was in town when they were working on KAMA's transfer of xmitter. They kept turning IBOC on and off for KLTN. When that was happening, KJOJ disappeared every time it was turned on. It appeared back when IBOC was turned off. KJOJ hasn't been as reliable in the Houston area ever since KLTN's HD remained on.