diff --git a/hosts/containers/sdrweb/adsb.html b/hosts/containers/sdrweb/adsb.html
index 89bddcda..47c00e74 100644
--- a/hosts/containers/sdrweb/adsb.html
+++ b/hosts/containers/sdrweb/adsb.html
@@ -51,7 +51,7 @@
              var maxalt = 40000; /* Max altitude in the average case */
              var selected = (Selected == plane.hex);
 
-             b = 0.25 + (0.75/maxalt*plane.altitude);
+             b = 0.5 + (0.5*plane.altitude/maxalt);
 
              /* As Icon we use the plane emoji, this is a simple solution but
                 is definitely a compromise: we expect the icon to be rotated