just putting the lowest figure I found out there.If you do math,there are 12 minutes national ads,4 minutes local ads.so nationally 24 30 sec ads per hour,so 30 x$ 5= $150 hourly.150 x 24 hrs=$3600 day,3600 x 30 day(av.)= $108,000 month,not bad for a very low side..know could be higher for network,just putting this out there for what it is worth..