diff --git a/packages/backend/src/server/api/endpoints/antennas/create.ts b/packages/backend/src/server/api/endpoints/antennas/create.ts
index c1ba7bcdf..a25b32b40 100644
--- a/packages/backend/src/server/api/endpoints/antennas/create.ts
+++ b/packages/backend/src/server/api/endpoints/antennas/create.ts
@@ -23,6 +23,12 @@ export const meta = {
 			code: "NO_SUCH_USER_GROUP",
 			id: "aa3c0b9a-8cae-47c0-92ac-202ce5906682",
 		},
+
+		tooManyAntennas: {
+			message: "Too many antennas.",
+			code: "TOO_MANY_ANTENNAS",
+			id: "c3a5a51e-04d4-11ee-be56-0242ac120002",
+		},
 	},
 
 	res: {
@@ -97,6 +103,14 @@ export default define(meta, paramDef, async (ps, user) => {
 	let userList;
 	let userGroupJoining;
 
+	const antennas = await Antennas.findBy({
+		userId: user.id,
+	});
+	if (antennas.length > 5 && !user.isAdmin) {
+		throw new ApiError(meta.errors.tooManyAntennas)
+	}
+
+
 	if (ps.src === "list" && ps.userListId) {
 		userList = await UserLists.findOneBy({
 			id: ps.userListId,