It’s a good time to be a worker in the wireless-communications field. That’s the conclusion of a report released Monday showing that more than 74 percent of 619 wireless-industry professionals rated the current job market as “strong” or “growing.” TelecomCareers.net, the job site that conducted the survey, said its job postings echo the upbeat sentiment. The site has nearly doubled the number of job openings posted in the wireless arena during the same period last year, and it has 40 percent more telecommunications jobs–now 5,000–offered overall than a year ago.