It’s not so much brick but any metal, which is higher in certain rocks hence certain bricks. But also any metal such as wires and pipes.
You should seek to maximise distance from metal (wires, metal pipes) and minimise distance and thickness. A door frame is often metal (newer homes) so doorbells have a basic issue in some properties.
A cheap way to fine tune is place a WiFi router at one end and use a free WiFi analysis app on your phone and move each end around. Increasing distance from wires, some bricks will have less metal and the angle to pass through least brick all add to improve signal.
Immediately at the door is often a metal - the door frame itself - so this is challenging for doorbell particularly. So moving it around to be further from the door may help.
Also reduce congestion on 2.4Ghz, change router to separate 2.4 and 5Ghz on separate SSID and then move as much as possible devices to 5Ghz SSID. Then there’s less competition on 2.4Ghz. More modern devices support 5Ghz, to each device used in the home and forget the 2.4Ghz and connect to the 5Ghz SSID, that removes much of your immediate interference.
I mention this has to be done at both ends, the router and the device. Each transmits and receives. It’s transmission causes induction in the nearby metal which then re-emits the signal and so produces a jamming effect. Reception is blocked by absorbtion. Re-emit is from wires of the order of magnitude of the the wavelength, which for 2.4Ghz means 12cm, so anything from half wavelength 6cm upwards is a re-emit source and will jam your transmit. Absorbtion is anything with a resonance with 2.4Ghz which includes for example water (how microwave ovens work).
So look at all of this at both ends of the problem, router and device.
The router usually has to be in a specific spot due to the cable. In this post the router is already very close, so look for metal near the router causing a jamming effect. Look around the router’s vicinity and see if its near any wires which are pointed parallel to the direction of transmission, e.g. if router and doorbell are at the same height so a line between then is horizontal, then look for any vertical metal such as wires embedded in walls and maximise your distance from them.
Finally, the two antennaes have to be pointing the same. They usually are, the antennaes of routers usually vertical to go further horizontally. (seeks teardown of doorbell for antennae orientation)…
Is this T8210?
I observe 3 things:
- the antennae is short, the optimal is 6cm this is less, so inherently it’s making its job harder for itself.
- it’s orientation makes it really want the router to be the same height and perpendicular, so the flat surface is square to the router. So any side to side or up / down alignment will worsen it.
- the width of the antennae should be able to around narrow absorption locally.
You’d do the same analysis of the router.
My best guess is it’s the door frame being metal and move FURTHER from it would do the trick, combined with moving all the devices to 5Ghz so 2.4Ghz is ringfences for the doorbell, will combined do the trick as a wall is the same thickness so can’t be altered.