Troubleshooting can range from simple to annoying.
First step is to look at the antenna. Is it still orientated to the direction you set it to? Being blown off course could yield these reception issues especially if you are dealing with medium to weak strength signals.
Second, did you waterproof your connectors? Water getting into your coax can degrade reception.
I'd also confirm reception issues by patching your coax into the TV directly. This is to make sure your TV is exhibiting the same problems as the video card. Then you know it's in your antenna system. If not,and everything is fine via the TV tuner you know it's video card has gone a little off kilter.
This is just the entry level tests. This can be a process of deduction.
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