Stacked VLA FIRST image of 17 (10 from this work and 7 from the literature) z > 6.5 quasars. The white ellipse shows the beam size, and the magenta circle (radius of 5″) marks the stacked quasar position. The pixel size of the stacked image is 1.″8 pixel−1. The rms of the stacked image is ∼3.7 × 10−2 mJy beam−1, four times better than the FIRST depth. +2σ contours are shown as cyan solid lines, and −2σ contours are shown as cyan dashed lines. No signal is detected at the quasar position.