A slot antenna of length L = 0.475 l may be fed off-center to obtain an input impedance Zs of the slot to be 50 ohms. Assuming that the feed point impedance of the complementary 0.475 l dipole is 70 + j0 ohms if it were fed in the center, calculate the distance Zf to use to obtain Zs = 50W for a signal frequency f = 1000 MHz.