Methods, systems, and devices for wireless communication are described to support increasing a sidelink feedback channel reliability. A second user equipment (UE) may transmit a sidelink message to a first UE, and the first UE may provide feedback for the sidelink message via an associated feedback opportunity. The first UE may perform frequency hopping from one symbol to another during the feedback opportunity, may transmit the feedback using multiple physical resource blocks (PRBs) within one symbol of the feedback opportunity, or both. A pattern for frequency hopping, or for the multiple PRBs, or both, may be defined or determined by a base station, the first UE, the second UE, or any combination thereof. In some cases, a pattern for frequency hopping or for PRB bundling may be defined or preconfigured at the first UE, the second UE, or both.