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You may wish to check with the city as this may fall into the same category as blocking a solar collector. If it's possible for you to move your antenna and get reception, then that's probably what you'll have to do. On the other hand, if it is now impossible for you to receive a signal due to the construction, that's something the city may deal with or may need to deal with in the future when doing plan checking. It can't hurt to go to the planning department and ask a few questions and see if there is a policy regarding blocking reception.