I have an 1815 w/ 19” dome mounted on the forward third of center console ttop. I have it on a 6” Seaview mount with a 2 degree forward cant. No other obstructions other than radio antenna. I have set everything to auto tune and implemented echo stretch, trail duration, etc. to improve marks. I don’t get radar marks beyond 1.5-2 miles, even large fishing fleets in the 2-5 mile range do not show up. Totally disappointed. Not sure where to go from here other than upgrading. Manual tuning makes me nervous since trying to optimize for 2-6 mile range may hide close objects. Any other users with same experience or recommendations for improvement?