All designs / Backgrounds / Radio and antennas
Radio telescope dishes under blue sky
Radio and antennas The photo fills the whole card. Your callsign and contact details go on a light or dark panel over it, and you can choose which at the design step.

A sample station on the dark panel, with the photo darkened 10 percent so the writing stays clear. The design step lets you choose the other panel or change the dimming. The bare photo is below.

Photo: "The Dévoluy Massif 4" by abuguet, CC0 1.0, via Wikimedia (https://commons.wikimedia.org/wiki/File:The_D%C3%A9voluy_Massif_4.jpg). Free to use on your cards.