The Bethel Board of Selectmen has approved spending $230,000 to purchase space it now leases on a radio tower to broadcast public safety communications.  The Board of Finance must approve the spending and residents need to vote at a special town meeting, which has not yet been scheduled.  Bethel currently leases space on a tower off Spring Hill Lane for 88-hundred dollars a year.  The lease is set to nearly double due to new microwave link antenna needed by emergency responders.  A half dozen or so antenna are already on the tower, including two cell phone companies.  Bethel could collect about $10,000 in revenue a year if the purchase goes through.