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We present an extension of the twistor-motivated MHV vertices andaccompanying rules presented by Cachazo, Svrvcek and Witten to the constructionof vector-boson currents coupling to an arbitrary source. In particular, wegive rules for constructing off-shell vector-boson currents with one fermionpair and n gluons of arbitrary helicity. These currents may be employeddirectly in the computation of electroweak amplitudes. The rules yieldexpressions in agreement with previously-obtained results for Z,W,\gamma^* -->qbar q + n gluons (analytically up to n=3, beyond via the Berends--Gielerecursion relations). We also confirm that the contribution to a seven-pointamplitude containing the non-abelian triple vector-boson coupling obtainedusing the next-to-MHV currents matches the previous result in the literature.Comment: 22 pages, 4 figures, v2 minor corrections and added commentary on  multiple vector boson

Twistor-inspired construction of electroweak vector boson currents