Some thoughts "Ed" …..
There are 5 main radio 'types' that
claim to go 5 miles.
In summary, as relates to your 5 mile specification:
My experience has been, given that
nothing is in the way, that 3 out of the 5 can actually be relied on to do so.
Furthermore, if one does not want to get an FCC license then it reduces it more so to
CB * (& possibly
MURS ** …. with an extremely remote possibility of
FRS***).
Said 'type' radios are listed in order of stock FCC-legally purchase-able Wattage (aka, power) output which is the biggest determinate, all things being equal, in how far one can reliably communicate 5 miles….
1. Amateur Radio (aka, Ham Radio). Power output is typically 5 to 100 Watts and even more. The handhelds are 5 to 8. Legal requirement: FCC License.
2. GMRS (aka, General Mobile Radio Service). Power output is 2 to 50 Watts. I do not know what the typical handheld range is. Legal requirement: FCC License.
3. CB (aka, Citizen Band). Power output is 4 Watts. No FCC License required.
4. MURS (aka, Multi-Use Radio Service). Power output is 2 Watts. No FCC License required.
5. FRS (aka, Family Radio Service). Power output is 0.5 Watts. No FCC License required.
[2-21-2021 Important Update:
My above statement that FRS is limited to 0.5 is WRONG - APOLOGIES as per my 2-21-2021 Post. One of FROZE's Links
has educated me that as of 2017 the FCC increased the FRS maximum wattage to 2.0 on certain channels.]
Greater Detail:*Easiest solution is the CB BUT the problem is size and weight on your bike (& part of this is because it takes typically 9 AA batteries to power it … in the vehicle one can use a cigarette plug, IF the vehicle has one – fewer and fewer do.). IF
nothing is in the way, a CB will send and receive 5 miles.
https://www.amazon.com/s?k=cb+radio+handheld&i=electronics&crid=2GL5XD98RRHR5&sprefix=cb+radio%2Celectronics%2C203&ref=nb_sb_ss_ts-doa-p_1_8**The next most likely is a MURS. It is much smaller than a CB; however, the power is only a maximum of 2 Watts. It might go 5 miles if
nothing is in the way. I do
not know
for sure. When you see these for sale if is not unusual for advertisements to give greatly exaggerated communication distance capabilities (e.g., keep in mind that the curvature of the earth actually starts to impede communication at 3-4 miles for a 6 foot tall person, thus 6-8 miles for 6 foot person to 6 foot tall person).
IF there are whole lot of Amazon Reviews saying this is successful for 5 miles, then this would likely be your optimal blend of size – weight – power level. IF not, then it would probably be best to go with the CB.
https://www.amazon.com/s?k=murs+radio&i=electronics&crid=1YCAZOSMJKXJV&sprefix=murs%2Caps%2C162&ref=nb_sb_ss_ts-doa-p_1_4***FRS. It puts out only 0.5 Watts.
[2-21-2021 Important Update : PLS see my above CORRECTION - APOLOGIES - In 2017 the FCC increase maximum FRS Wattage to 2.0] Not withstanding the advertisements that portray the capabilities of FRSs sending and receiving 30+ miles, read allllllll the reviews. I, personally, have NEVER known of anyone to get more than ONE mile with
nothing in the way.
https://www.amazon.com/s?k=frs+radio&i=electronics&ref=nb_sb_noss_1If you’d care to discuss in more detail, will be glad to do so - hit me with a Personal Message. I have tabular comparison chart(s) I could attach and send back your way, e.g./i.e.