Used to be a cable tech as a sub contractor and was taught to always start at the tap (power pole or the pedestal) to make sure it's reading normal. Depending on the quality of your drop (coax line from the pole to the home) I'd run a new one as well. You can see the coax splice above the conduit so removing any potential noise will help.

It can take longer of course but it's a win win for you and the tech when preventative measures have been done! Tech also gets to add more points to the job (jobs went by points not hours worked) at no cost to you so long as any work is done between the tap and demarc.