I had no TV reception at all when I moved into my home last year. The service man was prompt and courteous. He removed part of the old antenna and replaced it with a new component.
He could easily have charged me for a wholw new antenna and I would have been none the wiser. He also explained that I would have no receprion without an amplifier. He told me it would look like a telephone charger and suggested that I look in all the cupboards and garage to see if it had been put somewhere by the previous owner. He suggested that I try to contact the previous owner because sometimes owners or removalists pull them out and do not know what they are so they just lie around in someones miscellaneous box. The service man did not try to sell me am amplifier until he was certain I did not have one. I was happy with the price of $220 and pleased that I could pay the bill by bank transfer.
I would recommend this company

Approximate cost: $220