[Electron]

If by the word 'anchor' you mean the mount that the satellite dish is/was connected to and the DB4e is now connected mounted to on the side of the house about 7 feet above the ground and you will be moving the anchor/mount and the DB4e antenna to the chimney from the side of the house.

And can fasten the anchor/mount and DB4e to the chimney , then yes , Ok.

Having the DB4e antenna above the roof is the best.

However for your reception situation a height above the roof such as , 25 feet , 50 feet , 100 feet , 200 feet and etc. is not required.

A height above the roof for your reception situation is about 5 feet or so.

Tv antennas receive better when the Tv antenna has elbow room and nothing is in the way to reduce or block reception and the Tv antenna has a clear view of the transmitting antenna/s.