RadioBeacon

This is a fun one. Want to have your compass take you to your house and not the spawn? Want near by passer to hear about your store? RadioBeacon is just like it sounds. It is a radio tower that can transmit things over the airwaves. It's very easy:

To create a new radio beacon tower, place an iron block next to powered redstone.

The redstone current activates the antenna and it begins broadcasting signals within a three-dimensional spherical range, available to be received by other fixed antennas (simply click the iron block to show the received signals) or mobile radios (compasses held in your hand automatically scan for signals periodically).

Extending Range: To transmit and receive further, place any number of iron bars on top of the iron block.

As you build up, the new antenna radius will be shown to you in the chat area. The antenna tip can be destroyed to decrease the radius, or broken in the middle, and it behaves as you would expect, broadcasting from the highest continuous iron bar.

Setting Messages: Attach a sign to the side of your fixed antenna base, and the text of the sign will automatically be included in the transmission.

Relay Antennas: Built using a gold block instead of an iron block, relays retransmit messages from nearby antennas. To set a relay message, build a normal antenna within range and set its message. All relays within range will be notified using a special signal. Relays retain their message even if the original antenna is destroyed, so they can be used to add redundancy or extra range.

Weather: Rain decreases the transmission and reception radius. Thundering slightly increases it, but lightning has a chance to strike antennas, causing their destruction [Though this should be turned off]

So you get an iron or gold block, put a sign on the sign if wanted, place a single redstone and a torch on the other end ([BLOCK]-RedstoneDust-[RedstoneTorch]) and place a single column of iron bars on top until your broadcast distance is reached.

The other fun piece that was mentioned before were mobile radios. Literally they are just compasses but they will be able to receive these signal and navigate towards them.

To receive transmissions, hold a compass in your hand. It will continuously scan and report any nearby signals, their range, and message (if any). Switching to another item will turn off scanning.

To tune into a signal, left- or right-click the compass. The next scan will report which signal you have locked onto, and the compass needle will point in its direction.

If for any reason you find an issue that it won't work /toggleradio will turn your radio back into a compass.