I'm in mid-town Toronto in a south-east facing condo about 26 storeys up and have, in the past month or so, begun having issues receiving signal on 17-1 (WNED/PBS). For quite some time the channel has come in rock-solid, but now exhibits a weird behaviour where the signal comes in at inconsistent or odd times.

For example, during the day 17-1 is pretty much out, but sometimes later in the day or early evening it will come in for a short "promo" spot for an upcoming show. Then, when the programming is about to resume, it cuts out again.

Sometimes, late at night, the channel will come in perfectly and for a good, solid hour or two. Then it cuts out again.

Is something going on down WNED way that is causing this? As an aside, 17-2 (Think) exhibits none of these issues.