Alfa Network

Helium Hotspot Miner 5.8 dBi Indoor Antenna Kit, 11ft CFD-200 Antenna Extension Cable & Magnet Base for RAK Nebra Indoor Bobcat


Pickup available at 2251 NW 41st Street

Usually ready in 1 hour

This is an indoor omni-directional 915 MHz antenna with 5.8 dBi gain. Also included is a heavy duty magnetic base that measures 2.5 inches in diameter and weighs 11 ounces. The antenna is 15 inches tall. 

Total gain loss: 1.1 dB

Full Spec Sheet

This antenna is compatible with the RAK V2, Bobcat 300, Nebra Indoor, SenseCAP M1, Kerlink, Linxdot,, Helium Hotspot, Kerlink, FreedomFi & LongAP. (915 MHz USA and Australia versions only).

We do recommend RokTape to seal all outdoor connection points.

See also our Rokland 8 dBi 915 MHz Outdoor Antenna for Miners.

Need to extend the base? See our 10ft extension cable.

Is this 5.8 dBi indoor antenna comparable to the Rokland 8 dBi outdoor antenna?
This is shorter at 15 inches, not weatherproof, and best to put in a window, or a more open area inside vs. where your miner sits. Our outdoor antenna is more effective for IoT equipment/miners if you do not have a high density of other hotspots around you. However, this indoor kit could be a good upgrade over just having your factory antenna connected to your miner if an outdoor antenna is not possible (some HOAs do not allow an outdoor antenna for example).

Beware cautious of gain inflation- some places arbitrarily inflate antenna gain numbers to appear better than competing products. Because gain cannot be easily measured by the end-users, we have seen similar antennas marketed as numbers like 18 dBi to 30 dBi that are not even 20 inches tall. Why buy a 5.8 dBi when you can get a similar looking "18 dBi" for the same price, right? Rokland has been making antennas for over 14 years for WiFi, 4G, and other applications. Our 915 MHz antenna are listed with actual specifications. You also do not want extremely high gain as your path will be very narrow and miss other hotspots.

I see similar looking antennas online that say for 600 MHz to 2700 MHz, is a wider frequency spectrum better? 
Antennas with a focused spectrum will have better performance on that band segment vs antennas with very wide spectrum. We would not recommend using antennas that are also WiFi 2.4 GHz compatible with your mining equipment. This antenna has a frequency range of just 900-930 MHz to give you maximum performance.

More about this kit
You can use the included magnet base with the factory antenna of any of the listed miners, or with the included 5.8 dBi antenna. As gain increases, your vertical path will decrease, allowing you to communicate with hotspots from a greater distance but reducing your ability to be in the path of closer hotspots. As your community experiences new miners over time, it may be necessary to adjust what antenna you are using to deal with the density.

Frequency range: 900-930 MHz
Gain: 6 dBi
VSWR: ≤ 2.5
Polarization: Vertical
Directivity: Omni-Directional

Material: ABS, Copper
Antenna connector: RP-SMA male
Impedance: 50 ohm
Antenna height: 39 cm/15 inches
Base diameter: 2.5 inches
Base cable length: 11-foot CFD-200 shielded low loss cable

Low loss shielded cable
Our kit includes 11 feet of CFD-200 shielded coax cable built-in, with RP-SMA termination (to connect to your miner). CFD-200 has a gain loss of just 1.1 dB at 11 feet. Lower cost bases generally use RG58 cable which has a loss of 1.7 dB, over 50% more loss.

Recommended Use
Use with your Nebra, Bobcat, or RAK miner to help increase your coverage area. This is an indoor antenna and not rated for outdoor use. Check for Rokland brand outdoor mining antennas online. We recommend placing this inside near a window, or in a more optimal place for sending and receiving than where your miner currently is.

Compatible with:

Bobcat 300
Nebra Indoor/Outdoor
SenseCAP M1
Helium Hotspot


Warranty & Support:
Complimentary Telephone and Email/Live Chat Support (Click Here)

Sales tax is required in many states and will be added at checkout if applicable to your delivery state. Tax exempt forms can be sent to our support department.

Return Policy: FINAL SALE ITEM. This item is marked down on clearance and is not returnable except in cases of product defect. Items returned as defective found working may be returned to purchaser or Rokland reserves the right to charge a 20% restock fee.  For bulk purchases, see our bulk purchase return policy here.

Shipping & Returns
FREE Standard shipping on all items shipped in the USA! 
We are in Florida and ship to: USA, Australia, Austria, Canada, France, Germany, Israel, Netherlands, and the United Kingdom. Local pickup available in Gainesville, FL

Expedited shipping orders placed before 3PM EST weekdays will ship that day. Standard shipping orders ship within 1 business day.

Sales tax: shipments shipped to states in which we are registered to collect tax will have appropriate tax added at checkout. Tax exempt forms can be sent to our support staff who can activate exemption status. 

Lost packages and insurance

International Shipping:

Shipping options are visible in cart by using the shipping estimator. Transit times posted are estimates. International packages are subject to customs holds and duty payment may be required by your government on delivery. The cost of duty  is not reimbursable. Internatonal shipping charges are not refundable in the event of a return.


See item description for product specific return policies, and return policies vary by item.

Bulk/High Value Order Returns

Due to the labor required to package and ship bulk orders, as well as cost and stock issues involved in replenishing items, bulk orders of 5 pieces or more are not returnable unless the equipment is defective or mis-advertised, or a return period is prenegotiated. For non-defective returns over $500, a restocking fee may be deducted from the refund to cover bank or card processing fees.


Items on backorder or preorder will ship as estimated on the item page. You can cancel an order any time up until shipment. Orders with expedited shipping will arrive in the advertised time after the order ships, not after the order is placed.


If you want to cancel an order, please email or call us at (352) 372-9902. If your item has not been shipped, we will cancel the order and provide a full refund.

Customer Reviews

Based on 102 reviews
David Walden
Good antenna upgrade

I like the antenna, just wish it was weather proof for outdoor use so I didn't have to wrap it with waterproofing tape.

Another great product.

Good quality, works well.





Dennis Walker

Helium Hotspot Miner 5.8 dBi Indoor Antenna Kit, 11ft CFD-200 Antenna Extension Cable & Magnet Base for RAK Nebra Indoor Bobcat