Electronic vapour e-cigarette (ecig) DDA & RTA Mods. An RBA (rebuildable atomizer) is a general term for any deck where you can rebuild the atomizer coil yourself. The original atomizer platform is a RDA (rebuildable dripping atomizer) you very simply just drip your e liquid directly onto the cotton surrounding your atomizer coil. The next style to be developed is the RTA (rebuidable tank atomizer) which has a tank to hold your e liquid and adds a level of convenience. A third less common style is the RDTA which combines the convenience of a tank with the performance closer to a direct drip to your cotton.