Here is another dip station bar that you can use indoors to work your upper body hard. The Sunny Health & Fitness Multi-Function Strength Bar (SF-XF921050) has multi-grip hand positions and foam-padded handlebars. It has 660lbs max user weight capacity.
The SF-XF921050 has a crossbar design for stability. It has slip-resistant stabilizers. You can use this for arm raises, dips, pushups, and pull ups.