That said, it ultimately will depend on what the specs of the antenna you are using are. If it's something like this:
then as you can see the smallest beamwidth is 40 degrees so that would allow for you to be 20 degrees off centre either way.
That's the one. In fact, I have two of them though I am having other problems right now. I was getting constant 50 Mbps down on speed tests for some months. At the beginning of the year this suddenly dropped to 18 Mbps max, usually less, sometimes as little as just 2 or 3. We can't figure out why but our streaming has become unusable. The antenna's don't appear to have shifted, but that is the reason I asked my question. Now I am wondering if the Huawei could possibly be faulty. The speed has recovered briefly once or twice, but then it dropped back down again.
I seem to be in the exact predicament as well.
Same Aerial, same modem, same problem, different ISP.
ISP is Farmside, who were very unhelpful when it came to advising on the issue. Their solution was to send a tech ($150+gst) to look at the aerial incase it had moved. With the beam angles previously advised, a degree of rotation should not cause a major issue, if it had moved at all. It would have been easier if the tech who did the install, marked its alignment at install time, so I could visually check if it had moved.
Apparently 4G is not available, however the connection when set up was showing 4G at full strength, and down and up connections were around the 30Mbps mark. Now seeing 3G connectivity and connection speeds occasionally below 1Mbps.
Connection is coming off a vodafone tower.
Interesting to see what comes of this.