I just can't get enough of Realty Income (O 0.36%) this year. I have bought shares of the leading real estate investment trust (REIT) several times, including in the past week. The main reason is its high-yielding and steadily rising dividend. Given the REIT's current value proposition, I'll probably continue buying more shares any chance I get. Here's why I keep adding to my position.An excellent income streamRealty Income is an amazing dividend stock. The REIT makes monthly dividend payments (it calls its ...