Your rose is probably an old one that wasn't well cared for. Most hybrid teas grow into ugly, tall and gangly bushes when not pruned every year. If a HT is not pruned the lower part of the plant will become woody, making it less likely for new branches or leaves to come out of that part, giving them the 'naked legs' look.

I guess your plant needs a little rejuvenation. You can prune the plant at 4-6 inches in spring. This will stimulate the plant to sprout new canes from the base, called basal breaks, which will flower in the same year. In subsequent years you can decide to either keep the plant small by hard pruning again next spring or to prune a little less heavy so the plant becomes larger. Every year or so, you prune out an old branch to give room to younger ones. As I said, most hybrid teas become ugly when not hard pruned, but others have nice shrubby growth and can look good without hard pruning. It depends on the variety you have.

Please try to post your question at the Rose Forum as well. Much more people are active on the Rose Forum than on the European Rose Forum (this one). Other people there can probably give you better advice about rejuvenation of hyrbid teas than I can. I do not have much experience with them...

Rob