Cost-effective multibeam millimeter wave antenna solutions are required to enable the deployment of 5G NR . The complex trade-off between system complexity and RF requirements (such as high gain, number of beams, beam scanning capability, ) needs to be carefully optimized. Transmit- arrays (TAs) can provide a low-cost solution for multibeam operation by having a feeding array placed at a given focal distance. However, the maximum number of feeds and cross- over levels are constrained by the focal distance to aperture diameter ratio (F/D). On the one hand, reducing the F/D allows designing more compact feeding array elements, on the other hand, it limits the maximum angle coverage due to scanning aberrations. In this work, we show that a TA optimized for operating simultaneously with low F/D and wide-angle coverage can improve the performance of this classical configuration. We design a Ka-band multibeam antenna with a TA fed by a 19x5 array of standard WR38 waveguide operating with F/D=0.34. It provides 25 dBi of gain with scan losses below 3 dB when scanning in a zenith plane up to -55 degrees, covering 80 degrees (-55 to 25 degrees) with cross-over levels around 3 dB.