Will outdoor antenna help if reception is max?


A Chicago downtown location. Meridian 504, Nordost interconnect, Grado headphone amp and phones.
cazzguy
Assuming we're talking FM here. Your ideal antenna would be very directional and rotatable to aim at the station. In your location the problem isn't signal strength but reflections from all the buildings around you. The distortion caused by these ghost signals is appropriately named multipath distortion.
Concur with Ghostrider45's posting, but mostly because "multipath" reminded me of "multipass" from "The Fifth Element". :D
If reception is MAX than multipath or multipass distortion is MIN. The roof antenna has much higher gain than built-in or indoor so signal control is up multi-story. Higher level signals are MUCH easier to filter with great tuner such as Meridian.