Dear Mr. Berko: What can you tell me about a company called Uniti Group, which has a 15.49 percent dividend yield? Do you think the dividend is safe, and would you buy the stock for long-term growth and income? My stockbroker — who lives in Little Rock, Ark., where the company is based — is aggressively recommending the stock, and his enthusiasm is very catching, especially with the high-yielding dividend.