I'm new to SDR and have a NooElect R820T SDR & DVB-T and a NooElect Upconverter aka Ham It Up I'm using SDRsharp software and I have it all working on HF and above. I'm using a wire antenna that goes out the door by my desk and runs about 30 feet along the ceiling of our front porch. On 75, 40, and 20 meters the noise floor is the same level as the ham radio signals. I can barely hear the stations because of the high noise or because of the low signal level. 1 - Any tips on how to get more of the radio signal into the radio? 2 - I'm wondering if the high noise level is coming from my computer... the SDR is plugged directly into the USB connector on the front of the PC. What do you think? 3 - Any tips welcome. Thanks for the help.