Fresh off a 1-for-10 reverse stock split, is this satellite radio monopoly finally a buy?With shares down around 60% over the last five years, Sirius XM (NASDAQ: SIRI) has battered its long-term investors. And it's no surprise management turned to a 1-for-10 reverse stock split to keep its shares from getting too cheap. But while the split takes Sirius out of penny stock territory, it doesn't resolve the challenges that put it there in the first place. Let's dig deeper to see what the next five years could ...