diff --git a/.changeset/marantz-antenna-and-archive-url.md b/.changeset/marantz-antenna-and-archive-url.md
new file mode 100644
index 000000000..18da8e0e0
--- /dev/null
+++ b/.changeset/marantz-antenna-and-archive-url.md
@@ -0,0 +1,19 @@
+---
+"catalog": patch
+---
+
+Name the Marantz FM antenna connector and point a retired entry at its own page
+
+Five Marantz receivers and processors recorded their FM antenna jack as
+`proprietary`, which said the connector had no standard name. It has
+one: the threaded 75 ohm coaxial F connector, read off the NR1711's own
+rear-panel photograph and confirmed by the F-plug on the supplied indoor
+antenna in each owner's manual. `f-type` joins the connection
+vocabulary and the five entries use it, so a reader can tell this jack
+from the AM spring terminal beside it.
+
+The M-CR612's `url` pointed at the live-catalogue path, which answers
+200 only by redirecting to the archive path. Marantz moves a product's
+path rather than its id when it retires one, so the entry now names the
+page that serves it directly. It was the only retired Marantz entry
+still carrying the pre-archive path.
diff --git a/data/hardware/marantz-av8805a.yaml b/data/hardware/marantz-av8805a.yaml
index bc2c49aa9..b1b25e01b 100644
--- a/data/hardware/marantz-av8805a.yaml
+++ b/data/hardware/marantz-av8805a.yaml
@@ -328,7 +328,7 @@ io:
     signalFlow: input
     category: digital
     type: rf
-    connection: proprietary
+    connection: f-type
     maxConnections: 1
     position: Right
   - key: bd0mpPpW
diff --git a/data/hardware/marantz-cinema-30.yaml b/data/hardware/marantz-cinema-30.yaml
index 7aaf2aaf6..56954a7a8 100644
--- a/data/hardware/marantz-cinema-30.yaml
+++ b/data/hardware/marantz-cinema-30.yaml
@@ -206,7 +206,7 @@ io:
     signalFlow: input
     category: digital
     type: rf
-    connection: proprietary
+    connection: f-type
     maxConnections: 1
     position: Right
   - key: mqC9hY7s
diff --git a/data/hardware/marantz-m-cr612.yaml b/data/hardware/marantz-m-cr612.yaml
index 368aa36d2..07ed9e265 100644
--- a/data/hardware/marantz-m-cr612.yaml
+++ b/data/hardware/marantz-m-cr612.yaml
@@ -5,7 +5,7 @@ primaryCategory: amplifier
 categories:
   - other
   - discontinued
-url: https://www.marantz.com/en-us/product/network-audio-players/m-cr612/137273.html
+url: https://www.marantz.com/en-us/product/archive-network-audio-players/m-cr612/137273.html
 prices:
   - amount: 650
     currency: USD
diff --git a/data/hardware/marantz-nr1711.yaml b/data/hardware/marantz-nr1711.yaml
index d99a47e5b..9d12b0cb9 100644
--- a/data/hardware/marantz-nr1711.yaml
+++ b/data/hardware/marantz-nr1711.yaml
@@ -163,7 +163,7 @@ io:
     signalFlow: input
     category: digital
     type: rf
-    connection: proprietary
+    connection: f-type
     maxConnections: 1
     position: Right
   - key: ZrEu4IsB
diff --git a/data/hardware/marantz-sr6015.yaml b/data/hardware/marantz-sr6015.yaml
index cb98bba1b..a6fc7ddd4 100644
--- a/data/hardware/marantz-sr6015.yaml
+++ b/data/hardware/marantz-sr6015.yaml
@@ -244,7 +244,7 @@ io:
     signalFlow: input
     category: digital
     type: rf
-    connection: proprietary
+    connection: f-type
     maxConnections: 1
     position: Right
   - key: F2JKAYnu
diff --git a/data/hardware/marantz-sr7015.yaml b/data/hardware/marantz-sr7015.yaml
index 1debce3ec..8a481924f 100644
--- a/data/hardware/marantz-sr7015.yaml
+++ b/data/hardware/marantz-sr7015.yaml
@@ -269,7 +269,7 @@ io:
     signalFlow: input
     category: digital
     type: rf
-    connection: proprietary
+    connection: f-type
     maxConnections: 1
     position: Right
   - key: Ttbo0Rjo
diff --git a/schema/CONTEXT.md b/schema/CONTEXT.md
index c39285614..7ac1bae59 100644
--- a/schema/CONTEXT.md
+++ b/schema/CONTEXT.md
@@ -861,6 +861,7 @@ rear-panel diagram — assign them with `pnpm enrich-io <slug>`, not during bulk
 - `thunderbolt 3`
 - `toslink`
 - `bnc`
+- `f-type`
 - `firewire 400`
 - `ethernet`
 - `ethercon`
diff --git a/schema/io-connections.yaml b/schema/io-connections.yaml
index b43f7b30a..2bac68333 100644
--- a/schema/io-connections.yaml
+++ b/schema/io-connections.yaml
@@ -44,6 +44,7 @@ connections:
   - thunderbolt 3
   - toslink
   - bnc
+  - f-type # threaded 75 ohm coaxial (FM/TV antenna and cable inputs)
   - firewire 400
   - ethernet
   - ethercon # locking Neutrik ethernet (e.g. SLink/gigaACE/Dante ports)