If there were no issues prior to your work, it is quite logical some of your work has been performed incorrectly. Confirm fuel filter is installed correctly and spark plugs are correct type and have correct gap. Did you fail to reconnect some wiring.
An antenna hidden under the factory dash will always be a neater job than gluing bits to the outside of the car. As for performance, "the juice is not worth the squeeze", to run to the outside of the car.