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This TCL Roku TV has a 4K resolution. The resolution cannot be manually manipulated. Image quality is often influenced by signal strength of what you are watching. When streaming, you would want to check your WiFi signal strength. For this TV, you would want to make sure that you have a minimum of 25.0 Megabits per second. When viewing over the air antenna content, you may need to adjust your antenna placement to get better reception. Hope this helps! Thank you, TCL Customer Support
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