Pierce Allman, the WFAA radio/TV reporter (also PD of the radio operation at the time) who famously recalled getting directions to a pay phone from Oswald as he was fleeing the School Book depository, is still alive, I believe. He looks good for a guy in his 80s.
Not sure about Sid Davis, who covered the assassination for the Westinghouse stations. One website claims he died in 1997, but that seems to be erroneous as he's been interviewed a number of times since. If he is alive today, he'd be 91.
Orion Samuelson, who broke the news on WGN Chicago during his farm news show on 11/22/63, is still with us at age 84. So is WTIC Hartford's Dick Bertel (now 87), who was on the air playing Mantovani records (his normal "Americana" music show having been cancelled because of the tragic news) when NBC Radio's continuous coverage began. (The station had broken the news about 20-25 minutes earlier during the "Mikeline" talk/advice show.)
In the Detroit Top 40 radio history book "Rockin' Down the Dial", Jay Butler, who worked at R&B powerhouse WJLB (then at 1400 AM) in 1963, tells of how he was on the air when the news broke and felt he should tone down his show but had to defer to station management who wanted him to continue as usual. As a result, Butler took many calls from angry listeners upset at his "disrespect." Butler may be one of the few people on the air at that time who is still in broadcasting today, hosting a weekend show on public station WDET-FM.