diff --git a/packages/backend-rs/src/service/antenna/cache.rs b/packages/backend-rs/src/service/antenna/cache.rs
index 65bd6efca9..ce83895368 100644
--- a/packages/backend-rs/src/service/antenna/cache.rs
+++ b/packages/backend-rs/src/service/antenna/cache.rs
@@ -2,24 +2,23 @@
 
 use crate::{database::db_conn, model::entity::antenna};
 use sea_orm::prelude::*;
-use std::sync::Mutex;
+use std::sync::{Arc, Mutex};
 
-static CACHE: Mutex<Option<Vec<antenna::Model>>> = Mutex::new(None);
+static CACHE: Mutex<Option<Arc<[antenna::Model]>>> = Mutex::new(None);
 
-fn set(antennas: &[antenna::Model]) {
-    let _ = CACHE
-        .lock()
-        .map(|mut cache| *cache = Some(antennas.to_owned()));
+fn set(antennas: Arc<[antenna::Model]>) {
+    let _ = CACHE.lock().map(|mut cache| *cache = Some(antennas));
 }
 
-pub(super) async fn update() -> Result<Vec<antenna::Model>, DbErr> {
+pub(super) async fn update() -> Result<Arc<[antenna::Model]>, DbErr> {
     tracing::debug!("updating cache");
-    let antennas = antenna::Entity::find().all(db_conn().await?).await?;
-    set(&antennas);
+    let antennas: Arc<[antenna::Model]> =
+        antenna::Entity::find().all(db_conn().await?).await?.into();
+    set(antennas.clone());
     Ok(antennas)
 }
 
-pub(super) async fn get() -> Result<Vec<antenna::Model>, DbErr> {
+pub(super) async fn get() -> Result<Arc<[antenna::Model]>, DbErr> {
     if let Some(cache) = CACHE.lock().ok().and_then(|cache| cache.clone()) {
         return Ok(cache);
     }
diff --git a/packages/backend-rs/src/service/antenna/check_hit.rs b/packages/backend-rs/src/service/antenna/check_hit.rs
index 0f297ccbb2..fff8962ed4 100644
--- a/packages/backend-rs/src/service/antenna/check_hit.rs
+++ b/packages/backend-rs/src/service/antenna/check_hit.rs
@@ -12,8 +12,6 @@ pub enum AntennaCheckError {
     Db(#[from] DbErr),
     #[error("Cache error: {0}")]
     Cache(#[from] cache::Error),
-    #[error("User profile not found: {0}")]
-    UserProfileNotFound(String),
 }
 
 fn match_all(space_separated_words: &str, text: &str, case_sensitive: bool) -> bool {
@@ -29,7 +27,7 @@ fn match_all(space_separated_words: &str, text: &str, case_sensitive: bool) -> b
     }
 }
 
-pub async fn check_hit_antenna(
+pub(super) async fn check_hit_antenna(
     antenna: &antenna::Model,
     note: &note::Model,
     note_all_texts: &[String],
diff --git a/packages/backend-rs/src/service/antenna/process_new_note.rs b/packages/backend-rs/src/service/antenna/process_new_note.rs
index b9eed0eff8..9e63b6065d 100644
--- a/packages/backend-rs/src/service/antenna/process_new_note.rs
+++ b/packages/backend-rs/src/service/antenna/process_new_note.rs
@@ -37,19 +37,18 @@ type Note = note::Model;
 
 #[crate::export]
 pub async fn update_antennas_on_new_note(
-    note: Note,
+    note: &Note,
     note_author: &Acct,
     note_muted_users: &[String],
 ) -> Result<(), Error> {
-    let note_cloned = note.clone();
     let note_all_texts = all_texts(
         PartialNoteToElaborate {
-            file_ids: note.file_ids,
-            user_id: note.user_id,
-            text: note.text,
-            cw: note.cw,
-            renote_id: note.renote_id,
-            reply_id: note.reply_id,
+            file_ids: note.file_ids.to_owned(),
+            user_id: note.user_id.to_owned(),
+            text: note.text.to_owned(),
+            cw: note.cw.to_owned(),
+            renote_id: note.renote_id.to_owned(),
+            reply_id: note.reply_id.to_owned(),
         },
         false,
     )
@@ -60,8 +59,8 @@ pub async fn update_antennas_on_new_note(
         if note_muted_users.contains(&antenna.user_id) {
             continue;
         }
-        if check_hit_antenna(antenna, &note_cloned, &note_all_texts, note_author).await? {
-            add_note_to_antenna(&antenna.id, &note_cloned).await?;
+        if check_hit_antenna(antenna, note, &note_all_texts, note_author).await? {
+            add_note_to_antenna(&antenna.id, note).await?;
         }
     }