At about 0630 eastern time, a Cessna 210L struck a fence during takeoff from a private airstrip in Fort Meade. Instrument meteorological conditions prevailed at the time and no flight plan was filed. The pilot was not injured. The pilot said he noticed fog getting heavier as he was making his engine runup, but he decided to depart anyway. During the takeoff roll, he focused on keeping the airplane straight but did not notice he was not rolling parallel to the runway until he saw the fence.